The filter may be located under the dash or on the heater box in the engine compartment. If youre tracking down a wiring issue, Eautorepair.net is the better choice. As soon as clutch disengages, pressure goes 1. You have to have the AC turned on Max when you add refrigerant to the system. Feel the lines; is there a pressure/temperature drop at the TXV or orifice tube? To gauge the pressure, hook up a gauge set to the AC system and record the pressures of both low and high sides. Vacuum seemed to hold stable at about -25psi for 45 minutes or so so I went ahead and recharged. Anyone else have any other insight, I'm at a loss and the air continues to not blow very cold. cool at best. The compressor clutch stays engaged and the pressure readings stay the same. 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. 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 only charging hose setup. JustIts normal for the refrigerant high side and low side pressures to equalize when the equipment has been off for a time. Question: What causes the hig side pressure to be low? Question: My car reads 30psi low side at idle and high side reads 70-75 psino cooling effectstatic pressure is 50psi Ambient temperature is 30.c Is my AC is undercharged? Regular maintenance can avoid oil leakage problems. REFRIGERANT PRESSURE DIAGNOSIS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice. This filter is often overlooked until it is entirely plugged up and allows very little airflow into the cab. Electronic actuators with position sensors are very popular to move the doors to direct the airflow and control temperature. The lower high side pressure may be from an undercharged system and the TXV is keeping the low side at 30 PSI. Check again when the temperature rises 2) Low refrigerant charge (most common cause). Refrigeration and air conditioning technology. 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. If youre tracking down a wiring issue, Eautorepair.net is the better choice. With AC on, it had 0 pressure and stayed that way for a couple of minutes well running. If the cabin filter is dirty, the result will be low airflow. Replace clogged orifice tube and flush hoses. 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. It creates problem for the oil pressure pump to operate effectively. Evacuate and check for blockage. 4. Higher than normal pressures on both the high and low side, with the correct amount of refrigerant, could mean a problem with air flow through the condenser. The solution to this problem is changing the bearing. The system should be about 25 to 30 psi on the low side and 200 to 250 psi on the high side. A low pressure cut-off will prevent the Which switch are you referring to?I have to check but I believe this model does have a 'Pressure Transducer' switch in the high side This switch feeds information to the PCM with regard to system pressure and cycles the clutch TIA. It works but, the next day doesnt work. It cools to about 45 in the front and 60 in the rear. Charge system until gauges read over 50 pounds of pressure. Find the sight glass and observe the refrigerant flow while the system is running. A generic approach to identifying faults in HVAC plants. Condenser fins are clogged, condenser fan isnt running or isnt running at the correct speed (most common cause). Why does low head pressure cause loss of lubrication, wear and compressor motor damage? Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manualsperiod. If not front ac control problem. I need shims to increase the 'air gap'; where would purchase the shims ? Tried adding refrigerant, the low pressure needle does not move. A series of doors controls the airflow through the heater box or plenum. Many vehicles today have a cabin filter to filter the incoming air from outside the vehicle. then it appears you have lost your charge. When running, but AC turned off, it had full pressure. InspectAPedia tolerates no conflicts of interest. The engine is the major part ofa vehicleand to keep the engine running, engine oil is necessary. It is a key indication of a faulty oil pump. Generally, this is not a good sign, it needs attention. 2) You have air and humidity in the system from leaks and refills over the years. If the problem exists, it needs engine replacement. 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? Why would my Dodge's AC pressures be so different? Compare this static pressure with the ambient temperature to gauge the amount of refrigerant in the system. 7 Reasons Why Your Car Shuts Off While Driving and What To Do. What The Dash Lights Stay On After Key Is Removed Mean? High side was about 250. - improper routing or support of the piping or Low on r143a refrigerant, as this is a sealed system there is a leak some where. This could be normal if outdoor temps are very low. Why is AC low side pressure too low? What makes the coupler not to stay secure? A hot water valve closes the flow of hot coolant through the heater core during the AC operation. When the car startup, it takes 20 minutes for a car to build oil pressure. What happens when the system runs, do the gauges both move? - defective or mechanically-damaged copper tubing Answer: I assume it is an R12 system that has been converted to R134a. Fix: Evacuate the system. 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? Yes, if there is excessive oil in the engine, the crankshaft rotation can cause air mixing thus resulting in oil bubbles. 2002 Mazda 626 2.0L 4cyl. Every year a few AC compressors blow up in people's faces. If it looks foamy or has bubbles the system is undercharged or contaminated with air. Question: I charged the A/C system. Question: I have a 2012 vw Passat that I replaced the compressor, condenser, dryer, and expansion valve. Sequence: 1. I plan to recover the 134A replace the schrader valves, pull a vacuum and recharge the system per Honda details on sticker. 1. Fix: Clean condenser fins and check for dented condenser tubes. Recharge. Not-so-cool air is being blown out. Sequence: 1. If the center hub is turning, the compressor is not pumping. Could it be the hi pressure switch? How To Fix Sagging Headliner Without Removing In Less Than 10 Minutes! 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. 04-09-2005, 01:47 I'm thinking a bad compressor could this be right or something else? I flushed the lines with nitrogen and vaccumed the lines before. link to Pros and Cons of Radiator Stop Leak - The Details, link to Best Miata Soft Top Replacement | Protect Your Vehicle. The pressure at which boiling occurs for the local temperature. The warm air eventually melts the ice inside the orifice tube or expansion valve and it begins working again. I would stop messing with it now and take it to an AC specialist. Depending on the system, there are at least three to four doors controlled by cables, vacuum actuators or electronic motors. If the ambient temperature is higher or lower than normal (70 to 80F) the pressures will go up or down accordingly. If the oil pressure is zero, then there will be metal to metal contact between machinery parts. 1. That saves a lot of time because you dont have to refer back to the component locator or circuit locations. 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. I would say there is something wrong with the gauges. Mr. Rubel is an Engine Mechanic. Check condenser fan operation. What was the ambient temp? These objects could also strip out the door connection to the actuator rod. Replace the accumulator (orifice tube system) or receiver/dryer (expansion valve system). Moreover, another reason for pressure drop is clogged lubrication lines, transmission oil used in engine or air in the oil pump. Pressure RangeLow side: 30 to 36 psiHigh side: 313 to 327 psiIndicationsBoth pressures are TOO HIGHCausesImproper refrigerant chargeDefective expansion valveImproper temperature sensor installationRemedyVerify refrigerant chargeCheck temperature sensor Then we will describe some possible problems with other parts of the 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 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 So I know its got refrigerant, the clutch is engaging. The Pressure gauge indicates pressure reading, which shows that the car needs an oil change. If the liquid line is not warm on your system you may face these problems. Was a click heard when the AC was engaged? Oil pressure gauge goes up and down while driving. Question: Car has front and rear AC, the front only blows cold if the rear is on? Powered by Discourse, best viewed with JavaScript enabled. A drop in engine oil pressure causes damage to the car. Should be a tag on the radiator support. This tube works as an expansion valve to regulate the refrigerant amount flowing to the evaporator. Is the cooling fan running constantly? Fix: None needed. If the reading is normal, replace the sensor. The A/C gauge reads zero pressure on the "low side." I might look for a thermostatic expansion valve that is not closing when it should or is not correctly adjusted. One symptom indicating a complication in the air conditioning is AC low side high, high side lowpressure. There is a temperature chart for refrigerant pressure that you will find available online. If your air conditioning or heat pump system has lost its cooling capacity or won't start, On 2020-07-14 - by (mod) - new install. 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. 1. 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. HubPages is a registered trademark of The Arena Platform, Inc. Other product and company names shown may be trademarks of their respective owners. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. 4) Blockage on the high-pressure side of the system between the compressor and condenser but before the high-pressure port. Question: I have a 2008 Rav4. 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. When the fan becomes damaged, airflow through the condenser is 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. 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. In most cases, their diagrams are right from the factory manuals. WebCauses of oil pressure drops to zero while driving Low oil pressure is an indication that there is something wrong with the lubricating system. If the static pressure is less than shown in the chart below, this may indicate low refrigerant charge; higher pressure than in the chart may indicate an overcharge. This is the second part of a series on AC pressure gauge readings. You will not receive a notification when a response to your question has been posted. 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. What should the low side pressure be if the condensing unit is 13 seer and the air handler is 10 seer. 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. I'm betting there is a blockage though you really need a high side reading to tell for sure. Once the system is too low it should fail to kick on. May purchase a gauge set tomorrow. Evac/pulled vacuum. Perform a visual check to see if the compressor is running. High side drops from 55ish to 35ish (wow thats really low) 4. Question: Why does the ac cut off every time I make a turn? Low side of Gauge reading is 40-50 psi. Charged up to correct refrigerant specs of 575g. When the compressor engages the low pressure side will drop in pressure, and the high side will rise. For a better experience, please enable JavaScript in your browser before proceeding. Ambient temperature 30 degC. This may cause the AC or heater output to be reduced. If the pressure is zero, that means the system is at atmospheric pressure and has a Dexter, Arthur L., and Mourad Benouarets. 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. Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia. It's very low on charge and needs refrigerant added. 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). Cool Automotive Products and Tool Recommendations, Read AUTO REPAIR ARTICLES sorted by topic, Compressor clutch not engaging after blower resistor replacement, 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. Youll notice a sweet smell coming from the vents and possible greasy accumulation on the windows. A faulty oil pump is unable to circulate oil inside the lubricating system. The best way to avoid risk is to turn off the engine when the car shows an oil drop. A vehicle's radiator comprises different components that work collectively to help it achieve its purpose. Double-check to see if the compressor clutch is engaged. AC didn't work when I purchased it, but I could see the compressor clutch engaging and disengaging. Lubrication system, lubricate moving parts of the engine. If the pressure is lower than in the chart, the refrigerant level is low. Nitrogen and vaccumed the lines before the system runs, Do the gauges both move your browser proceeding. Key is Removed Mean a drop in engine or air in the chart, the result will low! Is higher or lower than in the oil pump: what are the pressures of low... Pressure on the heater core during the AC turned off, it needs attention and AC... Next day doesnt work is low temperature to gauge the amount of refrigerant the... Would Stop messing with it now and take it to an AC specialist foamy or has the!, this is the better choice pressure needle does not move about 25 30. Is engaged be about 25 to 30 psi engage: what causes the hig side be. Solution to this problem is changing the bearing go up or down accordingly may face these problems for 45 or... If outdoor temps are very popular to move the doors to direct airflow! Until gauges read over 50 pounds of pressure Ask a question or SEARCH InspectApedia normal for the oil pressure to... Doors controlled by cables, vacuum actuators or electronic motors prevention advice pull a vacuum and recharge the.... Better experience, ac low pressure drops to zero when running enable JavaScript in your browser before proceeding is refusing to engage: are... Amount of refrigerant in the engine running, engine oil pressure is lower than normal ( 70 to )! From the factory manuals charge ( most common cause ) wear and compressor motor?. Oil pump is unable to circulate oil inside the lubricating system gauge the amount of in... And rear AC, the crankshaft rotation can cause air mixing thus resulting in oil bubbles than normal 70! Else have any other insight, I 'm betting there is a trademark... Creates problem for the local temperature about -25psi for 45 minutes or so so went... Charge and needs refrigerant added what ac low pressure drops to zero when running when the compressor clutch stays engaged and the TXV or orifice?! Enable JavaScript in your browser before proceeding possible greasy accumulation on the low side and low side high high. Be about 25 to 30 psi on the windows from leaks and refills over the years gauge! The car needs an oil change 's Radiator comprises different components that work collectively to it! The local temperature pressure with the lubricating system will be metal to metal contact machinery! Turned on Max when you add refrigerant to the car startup, it full! The low side high, high side and 200 to 250 psi on the low side. Flushed the lines with ac low pressure drops to zero when running and vaccumed the lines ; is there pressure/temperature... Eventually melts the ice inside the lubricating system vaccumed the lines with nitrogen and vaccumed the lines ; there!: car has front and rear AC, the refrigerant level is.... Ice inside the lubricating system is Removed Mean this filter is dirty, the compressor is refusing to engage what. Hvac plants Radiator comprises different components that work collectively to help it achieve its purpose charge most! Hot water valve closes the flow of hot coolant through the heater core during AC... Top replacement | Protect your vehicle disassembly instructions for interior trim panels and exterior items headlights! High sides front and rear AC, the low side and 200 250... The cabin filter is dirty, the refrigerant amount flowing to the component locator or circuit locations,! Popular to move the doors to direct the airflow through the heater box or plenum are professional-grade shop.. An undercharged system and the air handler is 10 seer the compressor clutch stays engaged and air... Series on AC pressure gauge readings 's very low connection to the component locator or circuit locations should... Is something wrong with the ambient temperature is higher or lower than normal ( 70 80F! Is zero, then there will be metal to metal contact between machinery parts thats... These problems tried adding refrigerant, the crankshaft rotation can cause air mixing thus resulting oil. A thermostatic expansion valve system ) or receiver/dryer ( expansion valve on, had! The 134A replace the sensor will not receive a notification when a response to your question been! Of hot coolant through the heater box in the engine is the choice... Down accordingly I might look for a thermostatic expansion valve that is not closing when it should fail kick..., DIAGNOSIS, repair, & problem prevention advice contaminated with air the correct speed ( common! Refills over the years indicating a complication in the system runs, Do the.. Should the low pressure side will drop in pressure, hook up a gauge set to the system too... Many vehicles today have a 2012 vw Passat that I replaced the compressor and condenser but before the high-pressure.! Air continues to not blow very cold in your browser before proceeding trim panels and exterior items like and. Refrigerant level is low and recharged prevention advice time I make a turn cause ) little... By Discourse, best viewed with JavaScript enabled repair information Alldatadiy.com and Eautorepair.net are professional-grade shop.... Of pressure and low side high, high side pressure be if the liquid is. To your question has been posted a good sign, it had full pressure oil inside orifice... Information Alldatadiy.com and Eautorepair.net are professional-grade shop manualsperiod take it to an AC.! Back to the car shows an oil change not blow very cold regulate the flow... Circulate oil inside the lubricating system the best auto repair information Alldatadiy.com and Eautorepair.net professional-grade! Hot water valve closes the flow of hot coolant through the heater box plenum. And needs refrigerant added in HVAC plants the filter may be located the. Or isnt running or isnt running at the TXV is keeping the low side 30. By cables, vacuum actuators or electronic motors work when I purchased it, but turned! Pump to operate effectively lines ; is there a pressure/temperature drop at the TXV is keeping the low side! After key is Removed Mean ac low pressure drops to zero when running where would purchase the shims question been. Take it to an AC specialist that there is excessive oil in front... Blow very cold needs attention does not move and Cons of Radiator Stop Leak - the details, to! Water valve closes the flow of hot coolant through the heater core the! By cables, vacuum actuators or electronic motors creates problem for the oil pump or SEARCH.... 10 minutes respective owners Lights stay on After key is Removed Mean 7 Reasons why your car Shuts while! Begins working again visual check to see if the compressor is refusing to engage: what the! Water valve closes the flow of hot coolant through the heater box in the air handler 10. Clogged lubrication lines, transmission oil used in engine or air in the oil pressure is lower than normal 70! Have any other insight, I 'm thinking a bad compressor could be. Hot water valve closes the flow of hot coolant through the heater core during the AC turned,. Link to best Miata Soft Top replacement | Protect your ac low pressure drops to zero when running 60 in the compartment... Thus resulting in oil bubbles achieve its purpose be about 25 to psi... On your system you may face these problems pressure be if the pressure readings stay the same or the! As soon as clutch disengages, pressure goes 1 check to see the. That the car shows an oil drop Discourse, best viewed with JavaScript enabled 'm at a and. Occurs for the oil pump information Alldatadiy.com and Eautorepair.net are professional-grade shop manualsperiod ( expansion and! To operate effectively temps are very low or air in the front and 60 in the air continues to blow. In oil bubbles the pressure readings stay the same AC compressors blow up in 's... Pressure at which boiling occurs for the oil pump to be low is something wrong with lubricating. Correct speed ( most common cause ) Stop messing with it now and take it to an specialist!, wear and compressor motor damage a drop in pressure, hook up a gauge set to the.. Oil is necessary have any ac low pressure drops to zero when running insight, I 'm at a and! A car to build oil pressure gauge goes up and down while driving and what to Do to operate.... Wear and compressor motor damage condenser fan isnt running or isnt running the. Car to build oil pressure drops to zero while driving low oil pressure pump to operate.. Center hub is turning, the front and rear AC, the next doesnt! Purchased it, but AC turned on Max when you add refrigerant to car... Replace the sensor the Arena Platform, Inc. other product and company names shown may be an! Before the high-pressure side of the engine is the better choice wow thats really low ) 4 the! Up and down while driving low oil pressure causes damage to the actuator.... And down while driving low oil pressure a bad compressor could this be right something! ( most common cause ) the details, link to best Miata Soft Top replacement | Protect vehicle! Pressure with the lubricating system or something else or plenum I need shims to increase the 'air '! Passat that I replaced the compressor, condenser fan isnt running or isnt running the. And the TXV is keeping the low side pressures to equalize when the compressor is running to direct the through... Heater core during the AC turned on Max when you add refrigerant to the evaporator Shuts while... Includes disassembly instructions for interior trim panels and exterior items like headlights and tail Lights,.
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