For a better experience, please enable JavaScript in your browser before proceeding. Continue readingat REFRIGERANT PROBLEM TYPES or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX. Question: I have a 1996 Dodge Ram Diesel. Bad AC Compressor. Low side of Gauge reading is 40-50 psi. Sequence: 1. High side reading stays stagnant at 100PSI. Ltd., 2010. But the expansion valve or orifice tube is stuck or clogged so its not dispensing high-pressure liquid refrigerant into the evaporator coil. To control these doors a variety of actuators have been used, such as: Service Tip: A common problem with all actuator types is paper clips, pens, keys and other foreign objects falling down from the dash defroster vents into the heater box and jamming the doors. Possibility #1 AC low side pressure is Low because the system is undercharged. Drive Accord forum, a community where Honda Accord owners can discuss reviews, service, parts, and share mods. It works but, the next day doesnt work. In other words, the compressor is sucking, but theres nothing to suck. When I reduce the high side PSG the compressor kicks back in and the air is cold but not great. Content on driveaccord.net is generated by its users. Your Car Is Losing Coolant But No Leak: What Should You Do? Answer: Since I don't know what system you have, I have to guess. Pressure High: 65. Also suspect the switch.Measure while the compressor is refusing to engage: what are the pressures? Question: 2020 mustang air works when it wants to. This article is accurate and true to the best of the authors knowledge. Question: I charged the A/C system. U.S. Patent 6,324,854, issued December 4, 2001. 2. No. The two most common causes of low head pressure at an air conditioner or heat pump compressor motor are: Effects of low head pressure in a refrigeration system incude more than reduced cooling capacity of the system. High side drops from 55ish to 35ish (wow thats really low) 4. Its better to get it checks because low oil pressure causes damaged to the system. If you need to dig into your doors, dash or console, Alldatadiy.com is the better choice because Eautorepair.net doesnt any interior or exterior trim or body part removal. Question: I have a 2010 Nissan Altima that I change the compressor,expansion valve, condenser and switch. Answer: I assume it is an R12 system that has been converted to R134a. Why is AC low side pressure too low? He is sharing his knowledge to support the car lovers to solve the vehicle issues. The system is probably leaking. The clutch comes on now, but only stays on for a few seconds, but when it does, the pressure gauge on the low side falls to zero. Thats what I was thinking, evac and pull vacuum, then recharge if everything is good. If you need to dig into your doors, dash or console, Alldatadiy.com is the better choice because Eautorepair.net doesnt any interior or exterior trim or body part removal. To avoid expensive engine fixes, its better to check engine oil on a routine basis. When the proper pressure is reached, the vents blow warm air and the compressor drops out. The lower high side pressure may be from an undercharged system and the TXV is keeping the low side at 30 PSI. Thus, you will face low oil pressure while driving. ", The Fora platform includes forum software by XenForo, Amazon.com: Mastercool (81490) R134A Valve Core Remover Installer: Automotive, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada, driveaccord.net is an independent Honda enthusiast website owned and operated by VerticalScope Inc. AWD Tire Replacement Myth: Shall You Change All Four Tires? So I know its got refrigerant, the clutch is engaging. I'll take a look at the clutch gap. compressor is a Sanden model U4833..Now that you mention the clutch, I did jump the low pressure switch after the clutch disengaged and the clutch juddered.. If the system is continuing 3. There could be several causes leading to this condition including compressor issues, low-level of refrigerant, trouble with the heater or AC controls, and others. If the engine is damaged, it is an expensive and time taking process. If this valve doesnt close, the AC cold air will be heated by the heater core. Generally, an Engine. When its opening becomes bigger than the usual size, more refrigerant goes to the evaporator and creates pressure discrepancies. Also, was your fan on? Charge with DYE and retest with a black light. Does the condenser have bent or dirty fins? Descriptions: AC running @ 2000 RPM Low side drops to ZERO PSI on gauges, high side come up to about 165 PSI A Little wobble on the high side, but not a lot like i have More : AC running @ 2000 RPM Low side drops to ZERO PSI on gauges, high side come up to about 165 PSI A Little wobble on the high side, but not a lot like i Both gauges are reading zero. Please bookmark this page to make it easy for you to check back for our response. 50 psi on low pressure and 180 psi on high pressure with an outside of temperature of 75F, what does this mean for diagnostics of an AC system? Cory, thank you for an interesting question. Sometimes oil pressure light is on, but the oil level is normal and the engine is also performing as usual. Its better to replace the old oil pump with the new one rather than replacing it. Find the sight glass and observe the refrigerant flow while the system is running. Our Comment Box is provided by Countable Web Productions countable.ca, Click to Show or Hide Citations & References, ARTICLE INDEX to AIR CONDITIONING & HEAT PUMPS, Air Conditioning & Heat Pump Design, Inspection, Repair Books, Modern Refrigeration and Air Conditioning, Refrigeration and Air Conditioning Technology, Air Conditioning Inspection, Diagnosis, Repair, Efficiency, HOME INSPECTION EDUCATION COURSES (Canada), HOME INSPECTION EDUCATION: HOME STUDY COURSES, "Refrigeration & Air Conditioning Guide: A-1 Compressor: Compressor troubleshooting guide, understanding the cooling cycle", A-1 Compressor, Inc., Horace Park, 2009, original source: http://www.rpctubes.com/images/CompressorTroubleshootingGuide.pdf. That will determine what the high-side range will be. The filter may be located under the dash or on the heater box in the engine compartment. A forum community dedicated to Mazda 3 and all Mazda vehicle owners and enthusiasts. Oil pressure is responsible for the longevity of the engine. Did it speed up? Feel the lines; is there a pressure/temperature drop at the TXV or orifice tube? Low side pressure is controlled by the H-block. - corrosion Hooked up the gauges last night, high side pressure back to normal, although seemed high (350psi). Humidity in the system forms ice at the orifice tube or expansion valve and blocks the flow of refrigerant into the evaporator. Sounds like the cycling switch if one is used. Does the pressure go up? Oil pumps circulate oil throughout the engine. Yes, if there is excessive oil in the engine, the crankshaft rotation can cause air mixing thus resulting in oil bubbles. For a better experience, please enable JavaScript in your browser before proceeding. During Heat operation, all the air passes through the evaporator and the heater core. Answer: Sounds like it. At rest with the engine and A/C off the pressure should stabilize around 115-120 PSI on the low side. What could be the problem? Engine oil lubricates parts of the combustion and increases efficiency. Sometimes high temperature causes oil pressure to drop. If you take your vehicle to the mechanic, the mechanic will test the oil pressure with a new gauge. The warm air eventually melts the ice inside the orifice tube or expansion valve and it begins working again. Even small amounts of liquid refrigerant that may not damage compressor pistons, rings, or valves can, by washing out lubricating oils from the compressor motor, cause wear and loss of compression - permanently damaging the compressor motor. Mr. Rubel is an Engine Mechanic. The thicker the oil, the more the pressure is on the oil pump. They include wiring diagrams and technical service bulletins. Refrigeration & Air Conditioning Technology. Check again when the temperature rises. If there is a drop, there may be a restriction at the TXV or orifice tube. Check condenser fan operation. Explains different refrigerants and the refrigerant oils that are compatible with them. If you missed part I, start here. You need to have the system evacuated and charged after the leak has been repaired. When the compressor engages the low pressure side will drop in pressure, and the high side will rise. Why would they call it a bypass belt if that is the case? Replace expansion valve, flush and install in-line filter. The thing that doesnt make sense in there is that, to the best of my knowledge, you cant get at or near zero pressure with the compressor running. There are several constraints that cause this state. When the compressor runs the pressure drops - a lot. Pressure Low: 0. If youve attached gauges to your cars AC system and the pressure readings are steady but the AC low side pressure too Low, here are the possibilities: If the engine is running and your gauges are showing low side pressure too low and warm air is coming out of the vents, the system may be low on charge. Furthermore, If the pressure gauge indicates zero reading, it should be stopped at once. Smaller air conditioners or refrigeration equipment whose design does not include a refrigerant accumulator are at increased risk of damage from overcharge, liquid slugging, or oil circulation problems. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. Question: When I try to connect the coupler to the low side, it gives me a reading of 80-100 psi and it doesn't stay secure. Still haven't gotten actual gauges, but I'm concerned about a possible clogging somewhere due to the vacuum. I installed a new rheem 3ton 16 seer ac system and when I kicked the system on the suction pressure dropped to zero while the head pressure stayed at 300. Double-check to see if the compressor clutch is engaged. Recharge. Answer: Sounds like you have a leak. I'm thinking a bad compressor could this be right or something else? Fix: Remove excess refrigerant or evacuate and recharge with the correct amount. When the car startup, it takes 20 minutes for a car to build oil pressure. I did this 2 times and pressure is the on the low and high? The problem is that the defective oil sensor gives a false reading. - omission of coiled slack to avoid tension or stress on the piping Bad txv or tev. This condition has several possible causes: Since the most common problem is a lack of refrigerant, we will start there and show you how to use pressure measurements to find out how much refrigerant you have and what is happening to it. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters. The rear ac uses a TXV/H-Block and it sounds like the valve is not working. Low oil pressure is an indication that there is something wrong with the lubricating system. The engine oil moves through the lines and builds pressure. The pressure in everyone's system equalizes when the AC is shut off. This condition usually means there is a restriction in the system or the TXV or orifice tube is blocked or closed. Turned off AC, and it climbed to what looks like 75PSI well off. On the other hand, there is possibly a huge leak when the pressure is zero. How to diagnose an improper charge or quantity of refrigerant or "Freon" in an air conditioner, heat pump, refrigerator, freezer, or other equipment. Condenser Fan Problems: It's possible that you have debris blocking the airflow that's coming from your condenser fan motor, or it's possible the motor of the condenser fan itself has been damaged somehow. then it appears you have lost your charge. A vehicle's radiator comprises different components that work collectively to help it achieve its purpose. Applied Thermal Engineering 17, no. Possibility #1 AC low side pressure is Low because the system is undercharged. However, if theres a restriction on the high side of the system in the receiver/dryer, a crimped tube in the condenser or crud accumulation in the condenser or the expansion valve or orifice tube, theres nothing to suck. The reason of oil pressure gauge fluctuates while driving is contaminant oil. Working ok now I think but the high side pressure seems to be a lot higher than I remember (400psi) when filled enough to keep the low side above 20psi to keep the compressor on. Don't want to start another thread, but i can't seem to find an answer anywhere. Low side pressure was between 80-90 at idle. The air inside cab is down to 50 degrees. In most cases, their diagrams are right from the factory manuals. Reduced airflow or no airflow results in high refrigerant temp and high pressure coming out of the condenser and into the orifice tube or expansion valve. An engine requires lubrication to operate effectively. 1 (1997): 33-42. But if you see the AC low side high, high side low , such as the low side is 100 and the high side is 150, there might be problems with any of the inner components. The airflow goes through the evaporator and a door directs the air either through the heater core or around the heater core directed by the HOT to COLD selector. These objects could also strip out the door connection to the actuator rod. Observe the pressure gauges. Started out with low head pressure and not cooling good so changed out compressor and dryer added oil back to new unit put all together and pulled a vacuum added Freon and unit is cooling some and I have good low pressure but only 3 psi head hi pressure does anyone know my next move? Is compressor bad? Matching readings means that you dont have to worry about the level of Freon. The system is probably leaking. The AC Heater box or plenum is located under the dash. That's because it's the accumulator that prevents liquid slugging at the compressor. WebThe low side pressure drops and fluctuates consistently between 20 and 40 psi during compressor cycling. So replacing the defective pump or gauge will be a good idea. So you have to refer to the factory legends to learn the identification symbols and then refer back to circuit diagrams to find the splice and ground locations. Air started blowing less and less cold. Apologies for the delay. If your air conditioning or heat pump system has lost its cooling capacity or won't start, On 2020-07-14 - by (mod) - If this low air flow can't keep the car cool or warm, the problem may be incorrectly blamed on poor heater or AC performance. Voltage at the compressor, should be 12V. One interesting thing, is when I am sitting at a stop light or just idling and have the A/C on - every 5-10 seconds the car will shake a bit. There is a temperature chart for refrigerant pressure that you will find available online. Explains how to recharge a system, how to recover refrigerant, and how to replace AC components. Pros and Cons of Radiator Stop Leak - The Details. Blockage on the high-pressure side of the system between the compressor and condenser but before the high-pressure port. Youll notice a sweet smell coming from the vents and possible greasy accumulation on the windows. Start the engine and turn on the air conditioner. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. I installed a new rheem 3ton 16 seer ac system and when I kicked the system on the suction pressure dropped Low Oil pressure is not a good sign; it can lead to engine failure. Did the heater core/evap replacement myself last year and it has been blowing cold and holding steady pressure since about last week. 2) You have air and humidity in the system from leaks and refills over the years. Route checkups prevent major problems. Use an Ohmmeter to find if it is giving the correct reading. Thanks. Could it be the hi pressure switch? But if you see the AC low side high, high side low,such as the low side is 100 and the high side is 150, there might be problems with any of the inner components. Ling, Jiazhen, Yunho Hwang, and Reinhard Radermacher. The Miata of Mazda has always been known as a great convertible from the late 90s. All the airflow goes through both the evaporator and then the heater core. High side was about 250. This is the second part of a series on AC pressure gauge readings. Engine Size: 2.4l. Answer: With the system not running the pressure should equalize thru the Orifice Tube or H-block. Every year a few AC compressors blow up in people's faces. If you shut down the A/c while driving; the A/c can then be reactivated after several minutes .TIA .. Edited: Mon June 03, 2013 at 1:03 AM by Need Cooling. Getting no guage pressure on York heat pump in cooling mode but compressor is running. "Theoretical study on separate sensible and latent cooling air-conditioning system." - stress caused by movement of the condenser/compressor unit or (less common) of the air handler due to inadequate support of those components The car is a 2006 Hyundai Accent. new install. However, theres also the possibility that the system has gotten overcharged with too much refrigerant. Before starting, lets discuss why oil pressure is vital. However, low oil pressure indicates a significant problem. 3) Partial blockage of the orifice tube/expansion valve and the evaporator. If after 20 minutes, oil pressure is low, then the car needs to get inspected by a mechanic. Before deciding to replace the compressor, other components that you may check are the pressure switch, expansion valve, and the compressor clutch. If it doesn't pull enough air across the condenser, then the pressures can get really high. A clogged filter is due to leaks therefore needs replacement. Look at all hoses and look for signs of oil leaking as the compressor oil will leak out with the r134a. Actual readings will vary according to ambient temperature. When the temperature is set in between, part of the air will pass through the heater core. Answer: Sounds like the gauges are not connecting. There are tools that will replace the valve cores with no r134a refrigerant loss. Bump, still looking for a response. If dirt, fuzz, leaves or plastic bags are covering the surface of the evaporator, the airflow will be reduced along with the cooling capacity. If it doesn't, there could be an issue with the fan relay (common, search for threads). This could be normal if outdoor temperatures are very high. Question: I have a 1998 suburban with rear a/c. Identify the refrigerant before hooking up to a recovery machine. Works for a while then quits until it cools off under the hood is the classic clutch gap symptom. It could also be a failed thermal bulb that is unable to pick up the temperature signals or the TXV stuck to the open position. Either way, if you are low on refrigerant then you have a leak that needs to be repaired. If the pulley is seized, the pulley won't turn because the replaceable bearing is seized. Pressure that is too much lower or higher shows there is a problem. 2. 'Pressure will drop below 20 PSI on the low side and down to 150 on the High side ..The compressor will cycle at this point but engine temp is still relatively cool but after approx 10 minutes of driving the compressor clutch will not engage "Also suspect the switch." Theres a good chance that you didnt follow oldschools comments - and if so I think that you need a professional AC shop. If it looks foamy or has bubbles the system is undercharged or contaminated with air. yes, the electric fan closest to the radiator. White Smoke From Exhaust: Main Causes and How to Fix, 5 Types Of Burning Smell From Car: Causes And Solutions, Troubleshooting Catalyst Monitor Not Ready Issue In 7 Simple Steps. No, driving with zero oil pressure can cause damage to the engine and motors. Loss of power, low fuel economy, and engine staling are the common symptoms of a broken oil pump. The switch is functioning correctly. 1. Its not blowing in cold air, and sometimes its hotter air than it is outside. Wanted to post an update, I did all this last friday night. Alldatadiy.com, on the other hand, uses the factory diagrams. Question: I have a 2013 GMC Yukon XL, the low side reads 10psi and the high side reads 70 psi while the compressor is on and the clutch is engaged, is it low on Freon? Answer: Wrong or damaged coupler would be my guess. When the filter became clogged, the valve doesnt operate properly. I am sure it will cycle if all that is wrong is low freon. Here are two companion articles you will find useful if you repair AC systems. Webnew install. Evacuate the system and recharge with the correct amount of refrigerant. Yoshida, Harunori, Tatsuhiro Iwami, Hideki Yuzawa, and Masami Suzuki. Airflow across the condenser is critical to removing heat from the recently compressed refrigerant vapor and allowing it to condense into a lower pressure liquid. How are you going to do that? Didnt read anything on here about normal high side but high low side. Bump again, going on a mini vacation today, but if no response by this evening, I guess I will try just filling the AC and see what happens. The pressure developed helps the motor oil to reach all components in the system. link to Pros and Cons of Radiator Stop Leak - The Details, link to Best Miata Soft Top Replacement | Protect Your Vehicle. Also, may be slightly low on R134. And no offense was taken. He has more than 15 years experience on repair and maintenance of different kinds of vehicles. It is better to consult a mechanic. lubricating system majorly depends upon a pump, filter, and greasing line system. Engine coolant levels will be low. The pump allows the oil to reach the most remote part of the engine as well. The same problem arises when the o-ring seal outside of the orifice tube wears out. I have a 3 ton 410a Lennox with correct suction pressure however my high side pressure is way low. Compressor turns on. Twice I have tried to charge the A.C. system to the proper pressure. A forum community dedicated to all jeep owners and enthusiasts. Answer: The system can't be zero on the high side. The reason for the damaged oil pump is lack of maintenance and incorrect fitting of a pump. One typical issue is the unit not blowing cold air, which could be punishing in hot weather. Change in viscosity of oil can cause damage to the oil pump. Oil pressure drops to zero when engine starts then goes to 60,while driving after warm,pressure drops down 4.3 V6 vortec engine The 4.3 engine should have 20 to 30 psi at idle cold and around 50 to 60 psi running down the road. I tried recharging the A/C today and found out another thing. Adj. You can't really rule one thing out over another, but by your description, I would think if the blockage was in the condenser or O tube, the high side pressure would rise fast, but Once that happens, the refrigerant in the evaporator core becomes super cold which causes ice to form on the fins of the evaporator core. Answer: 1st we don't charge to a pressure, the system is filled to the proper capacity in pounds or kilograms. What makes the coupler not to stay secure? evacuated the system and recharged to the recommended amount of Freon R- 134 32o/zAt idle the compressor will stay running /clutch will be engaged ..but when compressor is put under a load the clutch will shut down from Low Side dropping under 25 PSI ..High side when compressor is engaged is 195 /Temp @ 85 FAny help much appreciated ..Thanks in Advance. Any ideas where to go from here? Fix: None needed. I have a 1955 Ford with a vintage A/C and the air is cold but when I check the A/C pressure it is 30/110 and the outside temperature about 85 degrees. No other leaks were found. I need shims to increase the 'air gap'; where would purchase the shims ? Then you can recover all the refridgerant you have put in and fix the leak then recharge and recheck. Any suggestions? Question: I have a 1998 Monaco motorhome. AC didn't work when I purchased it, but I could see the compressor clutch engaging and disengaging. When I turn ac on it will blow cool air for a minute then both high side and low side pressures drop to near zero and compressor will blow out refrigerant from the pressure relief? The solution to this problem is changing the bearing. The old systems used a sight glass to charge the systems. The typical complaint, when a vehicle has an air conditioning problem, is that the AC blows warm air. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. I'm not sure its the relay, it seems to be moving a lot of air along with the 5 blade mechanical fan. If the oil has impurities, it requires an oil pump to build more pressure. Explains the two basic types of air conditioning systems in cars and trucks work (thermal expansion valve and fixed orifice tube). Just offhand, sounds like a low system charge but without knowing both high and low side pressures, etc. Answer: This means your low side pressure is above 150psi. What are the effects of low refrigerant pressure at the compressor or in the system? Use the leak tester for larger leaks and the dye with a black light for smaller leaks. Is there any resistance? Pull a vacuum to remove all moisture. It is not turning on and off at all, just constantly running. The reason behind zero oil pressure at idle is a defective oil pump. If the system is properly charged it seems the compressor is not working up to par. Question: During a pressure test, the low side is at 54 and the high side went to 150 and then dropped to 80psi? When the oil level bot changed regularly, the oil level can drop. thanks. My mechanic says any bypass belt still will use the pulley or pass through the area of the compressor pulley. (very common especially if youve tried to add refrigerant yourself). Record the pressures. However, thinner liquid requires less. During AC COLD operation, the blend door routes the cold air around the heater core. He is also providing training to mechanics and works as a Senior Mechanic of a well-known organization. The result is hot air out the vents. Anyone have any idea what the might be? The evaporator and suction line don't get cold at all? 3. If the problem exists, it needs engine replacement. The new engine has the highest oil pressure and flows and with high mileage engine bearing worn out. A series of doors controls the airflow through the heater box or plenum. A hot water valve closes the flow of hot coolant through the heater core during the AC operation. Hot in, cold out is restricted. If the pressure matches the chart below, this means the refrigerant level is close to what it should be. Keep a check for external oil leaks; it can cause oil drops. The pressures are 30psi on the low side and 165psi high side. 4. Question: What is wrong when your a/c is in retard section of low side gauge? Compare this static pressure with the ambient temperature to gauge the amount of refrigerant in the system. Usually, the high side is really high and low side really low. 98,000 miles The Arena Media Brands, LLC and respective content providers to this website may receive compensation for some links to products and services on this website. If the pressure is lower than in the chart, the refrigerant level is low. Cooling fan problem, plugged or blocked condenser are the probable causes. If the pressure is lower than in the chart, the refrigerant level is low. Air Conditioning (AC) System Operation with TXV or Orifice Tube. No hot water valve is needed because in cool mode the door closes off airflow through the heater core. On a 85 degree day:R22 - 200 roughly R410 - 300 roughly. So,a car needs a visit to a mechanic. Pricing: ---Eautorepair.net--- 1 month subscription $19.95 per vehicle 1-year subscription $29.95 per vehicle 4-year subscription $44.95 per vehicle ---Alldatadiy.com--- 1-year $29.95 subscription: additional vehicles $19/95 each 5-year $49.95 subscription: additional vehicles $34.95 each Which one should YOU choose? The blockage or stuck expansion valve restricts the flow of refrigerant into and out of the evaporator. Pressure will drop below 20 PSI on the low side and down to 150 on the High side .. It's very low on charge and needs refrigerant added. Pressure when AC off was about 50psi, but AC on, and it looked like a vacuum at 0psi. Sometimes the problem is not in the refrigerant part of the system at all; you may need to look at the flow of air from the AC system. Descriptions: AC running @ 2000 RPM Low side drops to ZERO PSI on gauges, high side come up to about 165 PSI A Little wobble on the high side, but not a lot like It had this problem prior to replacing these parts. 7 Causes Of Car AC Low Side Pressure Zero. The filter looks like a small air filter from a car. The pressures seem OK. Something should be getting cold. Did the R134 conversion but when i'm charging the A/C system and the pressure gets to about 20 psi, the compressor kicks on and the pressure drops to about 5 psi and I could be mistaken but I think if it was a bad expansion valve you would see abnormally high pressure on the suction side if the valve we're stuck open and abnormally low pressure on the suction side and high on the high side if the valve stuck closed. If you do not read any pressure with the compressor not running (should be >90 psi!) The high side reads 65 psi. Answer: By the temperature in and out. Oil pressure drops to zero is not a good sign. If the static pressure is low, a leak is probably present. However, it is always better to consult a mechanic before deciding to replace any part. What should the low side pressure be if the condensing unit is 13 seer and the air handler is 10 seer. It seems to me that the shaking is what happens whenever the compressor kicks on - it produces a sizable load on the motor and the shaking indicates that you probably have other problems w/ how the engine is running (fuel, spark, air). Like something it trying to engage and then doesnt. How To Fix Sagging Headliner Without Removing In Less Than 10 Minutes! Is there a possibility of a leak based off the gauge readings? If youre tracking down a wiring issue, Eautorepair.net is the better choice. Check again when the temperature rises 2) Low refrigerant charge (most common cause). That saves a lot of time because you dont have to refer back to the component locator or circuit locations. If the reading is normal, replace the sensor. Low side is way to high. Evac/pulled vacuum. Question: I have a 2012 vw Passat that I replaced the compressor, condenser, dryer, and expansion valve. After flicking off and on the AC, the 0 pressure remained when AC was on, but the pressure when AC was off rose past 50PSI, which was strange considering it started a hair over 40PSI. It sounds like a job for the shop unless you can set yourself up to correctly evacuate the system, then charge by weight, record high and low side pressures and outlet temp, then start looking for leaks with a electronic sniffer, you most certainly have a leak. Are you worried about what causes oil pressure drops to zero while driving? Oil pressure gauge goes up and down while driving. Answer: Does the compressor kick on with the front ac on only? WebThat is the reason why the oil pressure drops to zero while driving. It has a new compressor, orifice tube, and accumulator. Lets look at some causes of low or zero oil pressure. The dirt on this evaporator has restricted the airflow and caused a lack of cooling. In addition, this website also participates other affiliate programs and may get a commission if anyone purchases through our links. The compressor will cycle at this point but engine temp is still relatively cool but after approx 10 minutes of driving the compressor clutch will not engage "Also suspect the Lower pressures may indicate low refrigerant level or a weak compressor. The possible reasons could be an excessive amount of Freon going to the evaporator. The high side pressure during cycling though is more difficult to explain in words. Symptoms of bad oil pressure sensor are Blinking oil pressure light, inaccurate reading, and oil pressure gauge indicating zero reading. PHI Learning Pvt. We've updated our forums!Click here to visit the new forum, Year: 2001Make: dODGEModel: rAM 2500Engine Size: 5.9Refrigerant Type: 134Ambient Temp: 85Pressure Low: 35Pressure High: 195Country of Origin: United States, Hello The Low side pressure on a Dodge 2500 drops below 25 P.S.I when RPM is increased ;thus the compressor clutch is shut down.. Fan turns on when the A/C is turned on and turns off when the A/C is off. You might be sitting at the borderline. Generally, If the oil level is normal and there is no unusual engine sound, the problem is a bad sensor. As the vehicle accelerates, pressure is built that causes oil pressure to increase. Ambient Temperature in F Low side Pressure Gauge reading and High side Pressure Gauge reading 65F Ambient temperature: Low side pressure 25-35 psi High side pressure 135-155 psi 70F Ambient temperature: Low side pressure 35-40 psi High side pressure 145-160 psi 75F Ambient temperature: Low side pressure 35-45 psi High side pressure 150-170 psi 80F Ambient temperature: Low side pressure 40-50 psi High side pressure 175-210 psi 85F Ambient temperature: Low side pressure 45-55 psi High side pressure 225-250 psi 90F Ambient temperature: Low side pressure 45-55 psi High side pressure 250-270 psi 95F Ambient temperature: Low side pressure 50.55 psi High side pressure 275.300 psi 100F Low side pressure 50-55 psi High side pressure 315-325 psi 105F Ambient temperature: Low side pressure 50-55 psi High side pressure 330-335 psi 110F Ambient temperature: Low side pressure 50.55 psi High side pressure 340.345 psi.
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