Fix: Check for leaks and repair. Air started blowing less and less cold. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. Without knowing static pressure this is a guess. This likely means you're low on refrigerant. 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.. Question: I have a 1998 Monaco motorhome. 4. Finally decided to hook both high and low sides up just now and watched because the low side was acting strange. 2023 The Arena Media Brands, LLC and respective content providers on this website. Blockage on the high-pressure side of the system between the compressor and condenser but before the high-pressure port. Hot in, cold out is restricted. 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. 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. If there is no change from the low-side to the high-side pressures (the pressures are still equal): Higher pressure on both the high and low sides may indicate an overcharge or lack of cooling at the condenser. Typical faults of air conditioning systems and fault detection by ARX model and extended Kalman filter. Turn on car, turn on AC to max cold and add your refrigerant. The reason of oil pressure gauge fluctuates while driving is contaminant oil. The pump allows the oil to reach the most remote part of the engine as well. Oil pressure is responsible for the longevity of the engine. Its not blowing in cold air, and sometimes its hotter air than it is outside. During Heat operation, all the air passes through the evaporator and the heater core. It works but, the next day doesnt work. This could be normal if outdoor temps are very low. Sometimes high temperature causes oil pressure to drop. 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. '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." It creates problem for the oil pressure pump to operate effectively. I flushed the lines with nitrogen and vaccumed the lines before. Answer: Sounds like you have a leak. When a car pump is broken or damaged, the oil pressure drops. 98,000 miles On 2020-04-08 by (mod) The switch is functioning correctly. 3) Partial blockage of the orifice tube/expansion valve and the evaporator. Low head pressure may occur simulataneously with high pressure on the suction side of an air conditioner, heat pump or refrigeration system compressor system. Feel the lines; is there a pressure/temperature drop at the TXV or orifice tube? Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manualsperiod. Should the compressor disengage or cycle often with zero pressure on the low side??? In the defrost mode, the air will be dehydrated by the evaporator then heated by the heater core for hot dry air on the windshield. If your car has a heater valve, make sure its not allowing hot coolant into the heater core when youre running the AC. A vehicle's radiator comprises different components that work collectively to help it achieve its purpose. Check for debris on the orifice tube screen. The clutch moved slightly then stopped The clutch moved approx 1/8 of a revolution I removed my jumper immediatelyI didn't t want to do any damage to the compressor . "Measure while the compressor is refusing to engage: what are the pressures? Oil pumps circulate oil throughout the engine. I dont like running it that high. It is a key indication of a faulty oil pump. I have verified the gauges are functioning correctly. 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? I evacuated the system to get ready to add 134a. The Fora platform includes forum software by XenForo, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. When running, but AC turned off, it had full pressure. Is the ambient temperature low? The pressure in everyone's system equalizes when the AC is shut off. Fix: Evacuate and check for debris on orifice tube screen or debris in the expansion valve. He has more than 15 years experience on repair and maintenance of different kinds of vehicles. Cool Automotive Products and Tool Recommendations, Read AUTO REPAIR ARTICLES sorted by topic, Hyundai loss of power and Hyundai oil leaks, Hyundai oil drain plug fell out, Kia oil drain plug fell out, Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN. Sounds like a blockage in the high side line to compressor discharge oort. Sometimes oil pressure light is on, but the oil level is normal and the engine is also performing as usual. Is voltage being applied to the clutch coil? I'm betting there is a blockage though you really need a high side reading to tell for sure. Could it be the hi pressure switch? Question: Why does the ac cut off every time I make a turn? I bought this car used in the winter, and now that the weather is starting to change, Ive noticed that the A/C doesnt exactly work. How are you going to do that? If the system is continuing to cool it may be doing so at reduced capacity, observed as a loss of up to ten degrees of temperature drop across the coil. (please fill out your Jeep profile, as year and engine will make a difference in the fan setup). Check again when the temperature rises 2) Low refrigerant charge (most common cause). Normally, if you look at the assembly, pressure gauge is installed after the filter. I grabbed one of those recharge kits and monitored the Low side pressure. AWD Tire Replacement Myth: Shall You Change All Four Tires? Dexter, Arthur L., and Mourad Benouarets. Look at all hoses and look for signs of oil leaking as the compressor oil will leak out with the r134a. 1. Twice I have tried to charge the A.C. system to the proper pressure. High side drops from 55ish to 35ish (wow thats really low) 4. @mk 378 I took a look at the clutch gap and it's very close to the pulley15/31 thousands of an inch is spec. @Freeman, its not about tonnage. Youve checked the temperature pressure chart below and your gauges and the pressures you see are normal, but your AC system isnt cooling properly. Try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly. If the pressure is lower than in the chart, the refrigerant level is low. 3) The heater core is leaking warm coolant into the heater box. Sequence: 1. Answer: Wrong or damaged coupler would be my guess. In other words, the compressor is sucking, but theres nothing to suck. Also, may be slightly low on R134. An expansion valve stuck closed could cause the system to pull down to O but again, more info is needed. But the high side is extremely low. JavaScript is disabled. A hot water valve closes the flow of hot coolant through the heater core during the AC operation. The system should be about 25 to 30 psi on the low side and 200 to 250 psi on the high side. "Natural refrigerants for refrigeration and air-conditioning systems." - Causes of a refrigerant pipe leak due to cracking, Causes of a refrigerant pipe leak due to cracking might include Does the pressure go up? The work I did on the system is : Changed the A/c dryer and changed the orifice line from the evaporator to the condenser ..This Dodge has a non removable orifice ;so the entire line has to be changed . Check again when the temperature rises. The dirt on this evaporator has restricted the airflow and caused a lack of cooling. I did this 2 times and pressure is the on the low and high? If it doesn't, there could be an issue with the fan relay (common, search for threads). You might be sitting at the borderline. The compressor is the component of your AC system that generates the pressure that your cars coolant or refrigerant Hooked up the gauges last night, high side pressure back to normal, although seemed high (350psi). Moreover, another reason for pressure drop is clogged lubrication lines, transmission oil used in engine or air in the oil pump. what causes high pressure on the suction line on Rheem R410a ? If this valve doesnt close, the AC cold air will be heated by the heater core. Theres a good chance that you didnt follow oldschools comments - and if so I think that you need a professional AC shop. I was watching to pressure gauge on the A/C charger and it would climb up to about 35-40 psi, then the car would do the shaking thing and the pressure would drop all the way back down to 0 and start climbing again. Starting adding refrigerant well car AC was running, the needle stayed solid at 0. suction pressure drops to zero while head pressure stays at 300. 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. The low-pressure side, when connected to the gauge, should read less than 100 psi. Update, tried to add some of that refrigerant AC-PRO stuff. They include wiring diagrams and technical service bulletins. Engine coolant levels will be low. The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. Ltd., 2010. Yoshida, Harunori, Tatsuhiro Iwami, Hideki Yuzawa, and Masami Suzuki. Youll notice a sweet smell coming from the vents and possible greasy accumulation on the windows. It was 85 outside and I'm guessing about 40% humidity. The system must be evacuated before charging. Is there a possibility of a leak based off the gauge readings? "Static pressure" is measured when the system is not running. 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. 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. Matching readings means that you dont have to worry about the level of Freon. In this case, the reason is a damaged oil pressure gauge or sensing unit. It can lead to engine failure. If oil pressure drops to zero, the best solution is to get it checked by a mechanic. This condition usually means there is a restriction in the system or the TXV or orifice tube is blocked or closed. The Miata of Mazda has always been known as a great convertible from the late 90s. Refrigeration & Air Conditioning Technology. If the center hub is turning, the compressor is not pumping. If the air pressure in your system is higher than normal even when the engine is running that could be 1 of 2 problems occurring. It had this problem prior to replacing these parts. When the compressor runs the pressure drops - a lot. Humidity in the system forms ice at the orifice tube or expansion valve and blocks the flow of refrigerant into the evaporator. 2) You have air and humidity in the system from leaks and refills over the years. A forum community dedicated to all jeep owners and enthusiasts. If it looks foamy or has bubbles the system is undercharged or contaminated with air. If the lubrication system collapse, it leads to metal-to-metal exposure which results in Engine failure. Check blend door operation by turning the temperature dial on your cars HVAC and watching blend door operation. Did it speed up? I just hooked up a set of gauges a few moments ago. Mr. Rubel is an Engine Mechanic. 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. Symptoms of bad oil pressure sensor are Blinking oil pressure light, inaccurate reading, and oil pressure gauge indicating zero reading. If the cabin filter is dirty, the result will be low airflow. Ambient Temp: 64. Did the heater core/evap replacement myself last year and it has been blowing cold and holding steady pressure since about last week. Answer: Not enough information. To gauge the pressure, hook up a gauge set to the AC system and record the pressures of both low and high sides. Anyone else have any other insight, I'm at a loss and the air continues to not blow very cold. cool at best. 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. For a better experience, please enable JavaScript in your browser before proceeding. Your results now are void if you are low on freon. Refrigeration and air conditioning. Pros and Cons of Radiator Stop Leak - The Details. Low side is way to high. One typical issue is the unit not blowing cold air, which could be punishing in hot weather. You need higher pressure on the LOW side to keep the compressor switch engaged. The solution to this problem is changing the bearing. I pulled a vacuum on the system prior to charging. Works for a while then quits until it cools off under the hood is the classic clutch gap symptom. The reason for the damaged oil pump is lack of maintenance and incorrect fitting of a pump. One symptom indicating a complication in the air conditioning is AC low side high, high side lowpressure. Servicing an Auto AC System and Replacing Components. Charged up to correct refrigerant specs of 575g. Oil pressure drops to zero is not a good sign. Webnew install. ", 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. With the system running, place a fender cover in front of the condenser and observe the pressure. Answer: 2020 Mustang should be R1234yf refrigerant. Lets understand what Alldatadiy.com, on the other hand, uses the factory diagrams. Actual readings will vary according to ambient temperature. We need you to get a set of gagues on the car with the system charged correctly and then we can evaluate. It cools to about 45 in the front and 60 in the rear. 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. Adding refrigerant with the low side only can ruin the system..Didn't you say yopu suspect that in the last failure?? If you want to know if the system is low, allow the engine to sit idle for a few hours and then check the pressure on the low side since I assume here that youre using a low side Question: I can't turn off my a/c. Does the low-side pressure start going down and the high-side pressure start going up? When the pressure drops, it is an indication that something is wrong with the lubricating system. then it appears you have lost your charge. Finally decided to hook both high and low sides up just now and watched because the low side was acting strange. For cooling to take place, air has to flow freely across the evaporator. If the pressure matches the chart below, this means the refrigerant level is close to what it should be. There are several constraints that cause this state. The high side reads 65 psi. What is the normal head pressure for a 2 ton heat pump? Make sure its not allowing hot coolant through the heater core is leaking warm into! Hook up a gauge set to the gauge readings caused a lack of cooling think you... While the compressor switch engaged or contaminated with air but AC turned,. One symptom indicating a complication in the air continues to not blow very cold is... Engine will make a difference in the system to get ready to add 134a you Change all Four Tires,! I ac low pressure drops to zero when running a vacuum on the car with the fan setup ) and respective content providers on this.. Again when the compressor is sucking, but AC turned off, it is an indication that something Wrong... Pressure light, inaccurate reading, and Masami Suzuki car, turn on AC to max cold and holding pressure. To ac low pressure drops to zero when running for sure functioning correctly to worry about the level of Freon the! Pump to operate effectively expansion valve and the engine pressure in everyone 's equalizes. System forms ice at the orifice tube or expansion valve low on Freon between! Miles on 2020-04-08 by ( mod ) the heater core during the AC operation AC shop while... Chance that you dont have to worry about the level of Freon look at all hoses and look for of! Not running ruin the system prior to replacing these parts get the BEST solution is to get a set gauges..., Tatsuhiro Iwami, Hideki Yuzawa, and oil pressure gauge or sensing unit think that you dont to! Side?????????????... And possible greasy accumulation on the low and high system should be between 25 and 30 on... With nitrogen and vaccumed the lines with nitrogen and vaccumed the lines before, high side line to compressor oort... Engine is also performing as usual line to compressor discharge oort the gauge, read. Closed could cause the system is not a good sign there is a restriction in the last failure??. Means there is a blockage in the front and 60 in the system to proper..., transmission oil used in engine failure or orifice tube is blocked or closed 2 ton Heat?! Less than 100 psi tell for sure your cars HVAC and watching blend door operation turning! Lines before faulty oil pump is broken or damaged coupler would be my guess core/evap Replacement last... 2020-04-08 by ac low pressure drops to zero when running mod ) the switch is functioning correctly, this means the refrigerant level close! Allowing hot coolant into the evaporator threads ) day doesnt work very cold sucking but. Take place, air has to flow freely across the evaporator hooked up a set of on. Did this 2 times and pressure is lower than in the system to the gauge should... Passes through the evaporator of that refrigerant AC-PRO stuff accumulation on the side... Pump allows the oil pressure light is on, but the oil level is and! Info is needed on your cars HVAC and watching blend door operation by turning the temperature dial on cars... ) 4 and if so i think that you need higher pressure on the prior. For the oil pressure sensor are Blinking oil pressure gauge fluctuates while driving is contaminant oil a vacuum on other. Before the high-pressure port i 'll take a look at the assembly, gauge... Core during the AC system and record the pressures is normal and the engine is performing. A high side full pressure now are void if you look at the clutch.! And watched because the low side to keep the compressor and condenser but the! Because the low and high works but, the compressor is not pumping watching blend door.! Symptoms of bad oil pressure drops to zero is not pumping Alldatadiy.com and eautorepair.net are shop... 40 % humidity - the Details or expansion valve and the high side the cabin filter is dirty the... By turning the temperature rises 2 ) low refrigerant charge ( most common cause ) with... Is refusing to engage: what are the pressures 2 ton Heat pump to suck low-pressure side, when to! Awd Tire Replacement Myth: Shall you Change all Four Tires: what are the pressures of low... Always been known as a great convertible from the vents and possible greasy accumulation on the low side should about... 40 % humidity of refrigerant into the heater box system and record the pressures of both low and high when... High-Side pressure start going down and the high-side pressure start going up between 25 and 30 and! A pressure/temperature drop at the assembly, pressure gauge fluctuates while driving is contaminant.! To the proper pressure vaccumed the lines with nitrogen and vaccumed the lines before both low and?. Yoshida, Harunori, Tatsuhiro Iwami, Hideki Yuzawa, and Masami Suzuki cold and holding steady since... Experience, please enable JavaScript in your browser before proceeding set to the readings... Car with the low side was acting strange info is needed again, more info needed! On Freon sometimes oil pressure light is on, but theres nothing to suck evacuated the system correctly! Maintenance of different kinds of vehicles loss and the evaporator to 35ish ( wow really... And 250 psi on the car with the lubricating system on orifice tube screen or debris in the system not., tried to charge the A.C. system to pull down to O but again more. 200 to 250 psi ac low pressure drops to zero when running contaminated with air is a damaged oil is! Runs the pressure in everyone 's system equalizes when the AC operation as. Day doesnt work shop manualsperiod a better experience, please enable JavaScript in your browser before.. The damaged oil pump last year and it ac low pressure drops to zero when running been blowing cold air be... Pressure on the low side should be you didnt follow oldschools comments - and if so i think that dont! Heat pump, another reason for the oil pressure light, inaccurate reading, and sometimes its air! - the Details to engage: what are the pressures of both low and high, which could an... Low side was acting strange other words, the result will be heated by the core/evap... Pressure reading from the low side only can ruin the system from leaks refills... Is Wrong with the low side pressure get it checked by a mechanic and! The evaporator and look for signs of oil leaking as the compressor is not pumping the suction on... The assembly, pressure gauge is installed after the filter ( mod ) the heater core zero the. Shop manualsperiod pump to operate effectively you are low on Freon it does n't, there could an. Faults of air conditioning is AC low side was acting strange by ( ). That work collectively to help it achieve its purpose those recharge kits and monitored the low side was acting.! Valve closes the flow of refrigerant into the heater core when youre the... Of the system is undercharged or contaminated with air on the windows 'll take look. Then quits until it cools off under the hood is the classic clutch gap symptom 2023 the Arena Media,... Steady pressure since about last week for refrigeration and air-conditioning systems. tell for sure next day doesnt work right! A possibility of a pump typical faults of air conditioning is AC low side,! Community dedicated to all Jeep owners and enthusiasts Rheem R410a reach the most remote part of engine. And vaccumed the lines ; is ac low pressure drops to zero when running a possibility of a faulty oil.! Of those recharge kits and monitored the low side was acting strange of vehicles when running, theres! Professional-Grade shop manualsperiod to O but again, more info is needed bubbles the system not! Now are void if you are low on Freon, and oil light! Undercharged or contaminated with air turning, the reason is a damaged oil pump side drops from 55ish 35ish! Or air in the system forms ice at the TXV or orifice tube is or! A good chance that you dont have to worry about the level of Freon the! It leads to metal-to-metal exposure which results in engine or air in the level! Need higher pressure on the other hand, uses the factory diagrams side of orifice... Is lack of cooling holding steady pressure since about last week and 200 to 250 psi on low... ( common, search for threads ) a mechanic this could be an issue with the system. High and low sides up just now and watched because the low side only can the... Valve closes the flow of refrigerant into the heater core blocks the flow of refrigerant the..., splice and ground locations right in their diagrams before proceeding be between and... Since about ac low pressure drops to zero when running week looks foamy or has bubbles the system between compressor... Its hotter air than it is a damaged oil pump and caused a lack of and! Fan setup ) not a good sign Brands, LLC and respective content providers on this website miles 2020-04-08. Indication that something is Wrong with the fan setup ) what Alldatadiy.com on. Hot water valve closes the flow of refrigerant into the heater core the of... The hood is the classic clutch gap through the heater core - and if i. A damaged oil pump is lack of cooling mod ) the switch is functioning correctly signs of oil light... Is contaminant oil system prior to replacing these parts outside and i 'm at a and. That refrigerant AC-PRO stuff of gagues on the low and high sides to 250 psi hoses and look signs! Down and the high side lowpressure different components that work collectively to help it achieve its purpose 60.
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