This may cause the AC or heater output to be reduced. The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. - stress caused by movement of the condenser/compressor unit or (less common) of the air handler due to inadequate support of those components You will not receive a notification when a response to your question has been posted. The dirt on this evaporator has restricted the airflow and caused a lack of cooling. 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 Pressure that is too much lower or higher shows there is a problem. No, driving with zero oil pressure can cause damage to the engine and motors. It cools to about 45 in the front and 60 in the rear. Humidity in the system forms ice at the orifice tube or expansion valve and blocks the flow of refrigerant into 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. 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. If dirt, fuzz, leaves or plastic bags are covering the surface of the evaporator, the airflow will be reduced along with the cooling capacity. The high- and low-side pressures should be equal. Low pressure was normal, but the high pressure was extremely high. Vacuum seemed to hold stable at about -25psi for 45 minutes or so so I went ahead and recharged. I pulled a vacuum on the system prior to charging. Perform a visual check to see if the compressor is running. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. 1. 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? High side of gauge reading zero, but the cab is cool. Its not blowing in cold air, and sometimes its hotter air than it is outside. Evac/pulled vacuum. Top 10 Worst Tire Brands to AVOID Purchasing in 2022, Clever Tricks to Solve When the Anti Theft System Car Wont Start. Pros and Cons of Radiator Stop Leak - The Details. Then we will describe some possible problems with other parts of the system. Any ideas where to go from here? The Fora platform includes forum software by XenForo, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 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 Does that make sense? 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? Thanks for the input madmatt. Not-so-cool air is being blown out. Suppose you notice low oil pressure at idle. On 2020-04-08 by (mod) A low pressure cut-off will prevent the It could be an issue with the orifice tube too. It is not turning on and off at all, just constantly running. Clutch plate air gap between the plate and the pulley in specs. 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. I vacuumed the system and put new refrigerant. It works but, the next day doesnt work. 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 The lower high side pressure may be from an undercharged system and the TXV is keeping the low side at 30 PSI. 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 AC and heater operate out of the same box or plenum typically under the dash. 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. The system should cool down to 40 degrees. They include wiring diagrams and technical service bulletins. With the compressor Typically used on small engines. Chandra, Arora Ramesh. Generally, this is not a good sign, it needs attention. Low side is way to high. He has more than 15 years experience on repair and maintenance of different kinds of vehicles. The typical complaint, when a vehicle has an air conditioning problem, is that the AC blows warm air. Question: I have a 2008 Rav4. Observe the pressure gauges. The pressure developed helps the motor oil to reach all components in the system. yes, the electric fan closest to the radiator. 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 - something else I've forgotten but that a more-expert HVACR tech could add, What are the likely causes of a cracked pipe causing refrigerant leak in my aircon. The pressure in everyone's system equalizes when the AC is shut off. The filter looks like a small air filter from a car. Compare this static pressure with the ambient temperature to gauge the amount of refrigerant in the system. Riffat, S. B., C. F. Afonso, A. C. Oliveira, and D. A. Reay. Question: I charged the A/C system. Engine Size: 2.4l. Record the pressures. 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. This could be normal if outdoor temps are very low. When running, but AC turned off, it had full pressure. 1. The Fora platform includes forum software by XenForo, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. When the car startup, it takes 20 minutes for a car to build oil pressure. Starting adding refrigerant well car AC was running, the needle stayed solid at 0. Then you can recover all the refridgerant you have put in and fix the leak then recharge and recheck. Explains the two basic types of air conditioning systems in cars and trucks work (thermal expansion valve and fixed orifice tube). 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. During this shake the RPMs go up and down from 600 to 700 and then back down to 600. Hot in, cold out is restricted. There are tools that will replace the valve cores with no r134a refrigerant loss. Didnt read anything on here about normal high side but high low side. The Pressure gauge indicates pressure reading, which shows that the car needs an oil change. JustIts normal for the refrigerant high side and low side pressures to equalize when the equipment has been off for a time. Look at all hoses and look for signs of oil leaking as the compressor oil will leak out with the r134a. Blockage on the high-pressure side of the system between the compressor and condenser but before the high-pressure port. If oil pressure drops to zero, the best solution is to get it checked by a mechanic. I grabbed one of those recharge kits and monitored the Low side pressure. If the cabin filter is dirty, the result will be low airflow. The warm air eventually melts the ice inside the orifice tube or expansion valve and it begins working again. If the oil pressure gauge goes to the red zone, it means insufficient oil pressure that can cause engine damage. (please fill out your Jeep profile, as year and engine will make a difference in the fan setup). There are tools that will replace the valve cores with no r134a refrigerant loss. Similarly, the fan also has to spin when you turn the system on. In fact, the temperature is directly related to the systems pressure. Does the low-side pressure start going down and the high-side pressure start going up? System must be overcharged or your gauges are somehow connected wrong. The switch is located near the expansion valve. - defective or mechanically-damaged copper tubing Is voltage being applied to the clutch coil? What could be the problem? It has a new compressor, orifice tube, and accumulator. Explains different refrigerants and the refrigerant oils that are compatible with them. - vibration 1. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. Im completely stuck. Also, may be slightly low on R134. If you missed part I, start here. A generic approach to identifying faults in HVAC plants. No other leaks were found. I just hooked up a set of gauges a few moments ago. What is up with the high side? The reason of oil pressure gauge fluctuates while driving is contaminant oil. Thus, this problem requires immediate care. "Static pressure" is measured when the system is not running. With the compressor not running you should have 70+ PSI of pressure on the low side (this depends on ambient temperature outside, but at 70 degrees you'll see about 70 PSI, there are charts available via google). Tomczyk, John, "The Professor: Diagnosing Bad HVAC Compressor Valves", ACHR News, October 2013, original source: http://www.achrnews.com/articles/124501-the-professor-diagnosing-bad-hvac-compressor-valves, Tomczyk, John, "The Professor: Restricted TXV Metering Device", ACHR News, January 2011, retrieved 7 Aug 2015, original source: http://www.achrnews.com/articles/116322-the-professor-restricted-txv-metering-device, Tomczyk, John, "The Professor: Low Head Pressure, High Suction Pressure", ACHR News, March 2010, original source: http://www.achrnews.com/articles/115341-the-professor-low-head-pressure-high-suction-pressure, John Tomczyk , "Troubleshooting A Refrigerant Undercharge", ACHR News, January 2006, orignal source: http://www.achrnews.com/articles/96496-troubleshooting-a-refrigerant-undercharge. There is a temperature chart for refrigerant pressure that you will find available online. Recharge. 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. Bad AC Compressor. Can the compressor build the pressure? However, theres also the possibility that the system has gotten overcharged with too much refrigerant. It creates problem for the oil pressure pump to operate effectively. What was the ambient temp? 2002 Mazda 626 2.0L 4cyl. Fix: Clean condenser fins and check for dented condenser tubes. My mechanic says any bypass belt still will use the pulley or pass through the area of the compressor pulley. Check again when the temperature rises. The AC Heater box or plenum is located under the dash. Model: Accord EX. There is no frost on either of the lines. 1) The blend air door or actuator isnt working properly and youre getting heated air from the heater core thats mixing with the cooled air from the AC. Use the leak tester for larger leaks and the dye with a black light for smaller leaks. 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. In most cases, their diagrams are right from the factory manuals. This stuff is not so easy to mess with. Answer: The computer senses the extra load added by the power steering and turns off the ac until the load is reduced. 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. its hard to make a guess. The rear ac uses a TXV/H-Block and it sounds like the valve is not working. In this article, we will guide you on what to do when oil pressure drops to zero while driving? 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. Ambient Temp: 64. What should the low side pressure be if the condensing unit is 13 seer and the air handler is 10 seer. international journal of refrigeration 33, no. 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. Feel the lines; is there a pressure/temperature drop at the TXV or orifice tube? The high side pressure during cycling though is more difficult to explain in words. Ill try adding more in a little bit, but does anybody else have any ideas? suction pressure drops to zero while head pressure stays at 300. A clogged filter is due to leaks therefore needs replacement. JavaScript is disabled. If the system is properly charged it seems the compressor is not working up to par. Adj. The same problem arises when the o-ring seal outside of the orifice tube wears out. Sometimes high temperature causes oil pressure to drop. Thank you for heling out, anon.Content contributors are also welcome to share their contact onfo or on request we can add such to the appropriate article. 3 (2010): 510-520. WebWhat is normal automotive air conditioner pressure? When the compressor engages the low pressure side will drop in pressure, and the high side will rise. If the pressure is lower than in the chart, the refrigerant level is low. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manualsperiod. To avoid expensive engine fixes, its better to check engine oil on a routine basis. A drop in engine oil pressure causes damage to the car. Pressure High: 65. Replace the accumulator (orifice tube system) or receiver/dryer (expansion valve system). Adjust your Low Pressure control to stop before it hit 0 psi. In this case, the compressor is running and try to remove refrigerant gas from the evaporator. In addition, this website also participates other affiliate programs and may get a commission if anyone purchases through our links. Lower pressures may indicate low refrigerant level or a weak compressor. @Freeman, its not about tonnage. 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. 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. Could it be the hi pressure switch? It was 85 outside and I'm guessing about 40% humidity. I need shims to increase the 'air gap'; where would purchase the shims ? 2. 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. I have a 3 ton 410a Lennox with correct suction pressure however my high side pressure is way low. 1. Are you wondering why oil pressure drops and is it a serious problem? The pressures seem OK. Something should be getting cold. However, a radiator leak can occur if one of these components goes bad. Lets look at some causes of low or zero oil pressure. 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. This is the reason you can't add refrigerant. Regular maintenance can avoid oil leakage problems. However, it is always better to consult a mechanic before deciding to replace any part. That saves a lot of time because you dont have to refer back to the component locator or circuit locations. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. Electronic actuators with position sensors are very popular to move the doors to direct the airflow and control temperature. If the pressure is zero, that means the system is at atmospheric pressure and has a I would say there is something wrong with the gauges. Refrigeration and air conditioning technology. Engine coolant levels will be low. On the other hand, there is possibly a huge leak when the pressure is zero. 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. The old systems used a sight glass to charge the systems. 5. If the pressure is higher than the chart, the system is either overcharged or may contain air (non-condensable). Oil pressure turning to zero can cause damage to the engine. On a 85 degree day:R22 - 200 roughly R410 - 300 roughly. Answer: Usually, the problem is reversed. If the system is continuing 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.. When a car pump is broken or damaged, the oil pressure drops. When the engine is revved up, low side would drop to 45-55 and high side would climb some, running water over the condenser kept high side looking good. Wanted to post an update, I did all this last friday night. But the expansion valve or orifice tube is stuck or clogged so its not dispensing high-pressure liquid refrigerant into the evaporator coil. Typically an access panel either clips in or is bolted in to cover the replaceable filter. Turn on car, turn on AC to max cold and add your refrigerant. Fix: None needed. Could the compressor clutch be partially sticking? Answer: By the temperature in and out. When the fan becomes damaged, airflow through the condenser is Condenser fins are clogged, condenser fan isnt running or isnt running at the correct speed (most common cause). Was a click heard when the AC was engaged? 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. suction pressure drops to zero while head pressure stays at 300. I also agree with the others that you might consider getting an A/C shop to look at this as A/C work can be a bit dangerous on top of causing even more damage to the system. Secondly, evaporation can cause the oil level to drop. 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. Is the cooling fan running constantly? It is a key indication of a faulty oil pump. I have to bypass with the belt. PSI was around 60 off and 0 when on. But the high side is extremely low. A/C pressure drop when clutch engages. U.S. Patent 6,324,854, issued December 4, 2001. Check low side pressure last week and it was holding stead around 30-35psi (which seemed normal) but the compressor was cycling more than normal. Answer: With the system not running the pressure should equalize thru the Orifice Tube or H-block. If the center hub is turning, the compressor is not pumping. lubricating system majorly depends upon a pump, filter, and greasing line system. - improper brazing or soldering Shut the engine off and rotate the center hub by hand. Sounds like the cycling switch if one is used. Majorly the problem is the broken oil pump. Low side pressure was between 80-90 at idle. Usually, high oil pressure indicates the engine is cold, and oil has high viscosity. Anyone have any idea what the might be? Here are two companion articles you will find useful if you repair AC systems. REFRIGERANT PRESSURE DIAGNOSIS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice. what causes high pressure on the suction line on Rheem R410a ? Why would they call it a bypass belt if that is the case? A temperature-pressure chart can be used to compare the pressure of the refrigerant at a given temperature. Low side drops to Any suggestions? Question: The A/C compressor has seized on my 2000 Sienna. 4. Alldatadiy.com, on the other hand, uses the factory diagrams. Sequence: 1. Question: How do you tell if the condenser is restricted ? A pressure switch or sensor could be bad. The high side reads 65 psi. Defective Condenser Fan. "Natural refrigerants for refrigeration and air-conditioning systems." If your car has a heater valve, make sure its not allowing hot coolant into the heater core when youre running the AC. The effects of poor oil return to the compressor include first reduced cooling capacity and later damage to the compressor motor. Wear and tear cause oil to flow faster and decreases oil pressure. 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. WebThe low-pressure side, when connected to the gauge, should read less than 100 psi. Like something it trying to engage and then doesnt. I hear it's ok for it to cycle on and off, mine is about at a 20 second interval, maybe more. If there is no drop, there may be a restriction upstream from the TXV or orifice tube. With the system running, place a fender cover in front of the condenser and observe the pressure. Keep a check for external oil leaks; it can cause oil drops. The system is probably leaking. 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? When the temperature is set in between, part of the air will pass through the heater core. Answer: The system can't be zero on the high side. This likely means you're low on refrigerant. I'll do that tonight. Question: How about if the static pressure is not equal. It is better to consult a mechanic. Once that happens, the refrigerant in the evaporator core becomes super cold which causes ice to form on the fins of the evaporator core. This filter is often overlooked until it is entirely plugged up and allows very little airflow into the cab. Should the compressor disengage or cycle often with zero pressure on the low side??? On 2019-07-16 by I just install a 3 ton mini split pressures are equal what could be the issue it's still cool the liquid line is not warm thank you, I just installed a 3 ton mini split unit pressures are equal the liquid line is not warm the compressor sits above the cassette up on the roof my line is 15 foot long I'd appreciate any help thank you.
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