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Any suggestions? Fix: Replace a bad blend door actuator or faulty heater control valve or repair a faulty blend door or blend door linkage. Answer: Sounds like you have a leak. "You may want to invest in a torque wrench, since your torque by feel only consists of gorilla mode. Any thoughts? Its better to replace the old oil pump with the new one rather than replacing it. A clogged filter is due to leaks therefore needs replacement. When the car startup, it takes 20 minutes for a car to build oil pressure. This is the reason you can't add refrigerant. 1. Perform a visual check to see if the compressor is running. Pull a vacuum to remove all moisture. It can lead to engine failure. Answer: Not enough information. 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. What makes the coupler not to stay secure? Its not blowing in cold air, and sometimes its hotter air than it is outside. If the pressure is lower than in the chart, the refrigerant level is low. That saves a lot of time because you dont have to refer back to the component locator or circuit locations. One symptom indicating a complication in the air conditioning is AC low side high, high side lowpressure. This stuff is not so easy to mess with. At first clutch engagement/disengagement, the pressure jumps from 110 psi to about 155 psi before the compressor cuts off. If the liquid line is not warm on your system you may face these problems. Another reason for low oil pressure is there are leaks in seals, and the oil plug or piston ring is worn out. Lubrication system, lubricate moving parts of the engine. 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). Delmar Thomson Learning, 2009. I'm thinking a bad compressor could this be right or something else? Answer: The system can't be zero on the high side. If the pressure is lower than in the chart, the refrigerant level is low. In most cases, their diagrams are right from the factory manuals. 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. A forum community dedicated to Mazda 3 and all Mazda vehicle owners and enthusiasts. According to physics, thicker liquids require more pressure. AC Low Side High, High Side Low: Why Does This Happen? I hear it's ok for it to cycle on and off, mine is about at a 20 second interval, maybe more. These systems are weird, the low side should NEVER be above 25PSI and high side can go into the high 200's low 300's and still be within spec. Cooling fan problem, plugged or blocked condenser are the probable causes. The low-pressure side, when connected to the gauge, should read less than 100 psi. Are you wondering why oil pressure drops and is it a serious problem? Engine coolant levels will be low. Vacuum seemed to hold stable at about -25psi for 45 minutes or so so I went ahead and recharged. The lower high side pressure may be from an undercharged system and the TXV is keeping the low side at 30 PSI. If your air conditioning or heat pump system has lost its cooling capacity or won't start, On 2020-07-14 - by (mod) - Applied Thermal Engineering 17, no. Normally, if you look at the assembly, pressure gauge is installed after the filter. This filter is often overlooked until it is entirely plugged up and allows very little airflow into the cab. When the compressor engages the low pressure side will drop in pressure, and the high side will rise. The same problem arises when the o-ring seal outside of the orifice tube wears out. The AC Heater box or plenum is located under the dash. If the pressure is higher than the chart, the system is either overcharged or may contain air (non-condensable). "Natural refrigerants for refrigeration and air-conditioning systems." However, a radiator leak can occur if one of these components goes bad. 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. It's very low on charge and needs refrigerant added. Answer: Usually, the problem is reversed. A clogged filter leads to extended oil and thus result in poor combustion. 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 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. Answer: Wrong or damaged coupler would be my guess. We also explain the various causes of liquid slugging a compressor motor. Whitman, Bill, Bill Johnson, John Tomczyk, and Eugene Silberstein. Sounds like either a bad compressor or a bad H-block. Answer: Sounds like the gauges are not connecting. The filter may be located under the dash or on the heater box in the engine compartment. There are tools that will replace the valve cores with no r134a refrigerant loss. If the valve sticks closed, there will be no heat. During AC COLD operation, the blend door routes the cold air around the heater core. It works but, the next day doesnt work. However, it is always better to consult a mechanic before deciding to replace any part. Getting no guage pressure on York heat pump in cooling mode but compressor is running. The switch is located near the expansion valve. Actual readings will vary according to ambient temperature. 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. Check again when the temperature rises 2) Low refrigerant charge (most common cause). 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. High side reading stays stagnant at 100PSI. Low side pressure was between 80-90 at idle. Blockage on the high-pressure side of the system between the compressor and condenser but before the high-pressure port. The high- and low-side pressures should be equal. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. Answer: This means your low side pressure is above 150psi. 1. 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? Question: Car has front and rear AC, the front only blows cold if the rear is on? When the compressor runs the pressure drops - a lot. Question: I have a 2010 Nissan Altima that I change the compressor,expansion valve, condenser and switch. The dirt on this evaporator has restricted the airflow and caused a lack of cooling. Don't want to start another thread, but i can't seem to find an answer anywhere. Bad txv or tev. It could be an issue with the orifice tube too. Note: appearance of your Comment below may be delayed: if your comment contains an image, web link, or text that looks to the software as if it might be a web link, your posting will appear after it has been approved by a moderator. 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. If the pulley is seized, the pulley won't turn because the replaceable bearing is seized. when you have abnormally high refrigerant pressure on the low side, Wilson Feel the lines; is there a pressure/temperature drop at the TXV or orifice tube? I tried recharging the A/C today and found out another thing. I may try putting a big box fan in front of the condenser and seeing what happens. 7 Reasons Why Your Car Shuts Off While Driving and What To Do. If the air conditioning isnt blowing cold air and the low side pressure is too high, it could be caused by issues with the condenser fan. 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 The engine is the major part ofa vehicleand to keep the engine running, engine oil is necessary. Majorly the problem is the broken oil pump. Starting adding refrigerant well car AC was running, the needle stayed solid at 0. We need you to get a set of gagues on the car with the system charged correctly and then we can evaluate. The system should be about 25 to 30 psi on the low side and 200 to 250 psi on the high side. Adding refrigerant with the low side only can ruin the system..Didn't you say yopu suspect that in the last failure?? Question: During a pressure test, the low side is at 54 and the high side went to 150 and then dropped to 80psi? Twice I have tried to charge the A.C. system to the proper pressure. I don't have a tool to monitor the High pressure side. WebThe low side pressure drops and fluctuates consistently between 20 and 40 psi during compressor cycling. lubricating system majorly depends upon a pump, filter, and greasing line system. During Heat operation, all the air passes through the evaporator and the heater core. 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. Clutch plate air gap between the plate and the pulley in specs. Recharge. 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. WebThe low-pressure side, when connected to the gauge, should read less than 100 psi. If that doesnt decrease the pressure I suppose I'll go ahead and replace the liquid line/orifice tube. An oil pump is an essential part of the lubricating system. You can measure the refrigerants pressure at a given temperature. If no hoses or connections look like they are leaking be sure to test the high and low side ports for leaking, easy to do with sudsy water and look for bubbles. The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. If the pressure is zero, that means the system is at atmospheric pressure and has a Loss of power, low fuel economy, and engine staling are the common symptoms of a broken oil pump. 3) Partial blockage of the orifice tube/expansion valve and the evaporator. 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. Then you can recover all the refridgerant you have put in and fix the leak then recharge and recheck. Low side pressure is controlled by the H-block. When running, but AC turned off, it had full pressure. Install an in-line filter to prevent re-occurrence. Refrigerant Type: 134A. (very common especially if youve tried to add refrigerant yourself). An engine requires lubrication to operate effectively. American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., Atlanta, GA (United States), 1996. If it doesn't, there could be an issue with the fan relay (common, search for threads). 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. Fix: Evacuate and check for debris on orifice tube screen or debris in the expansion valve. What happens when the system runs, do the gauges both move? "Air-conditioning servicing system and method." Oil pressure drops to zero is not a good sign. High side was about 250. (A-1 Compressors 2009). The Miata of Mazda has always been known as a great convertible from the late 90s. Content on driveaccord.net is generated by its users. suction pressure drops to zero while head pressure stays at 300. Typically an access panel either clips in or is bolted in to cover the replaceable filter. Answer: By the temperature in and out. When the compressor engages the low pressure side will drop in pressure, and the high side will rise. Any input based off the above symptoms? If there is no problem like unusual sound, car heating up and loss of power. Tried adding refrigerant, the low pressure needle does not move. Fan turns on when the A/C is turned on and turns off when the A/C is off. 3) The heater core is leaking warm coolant into the heater box. No other leaks were found. If the engine is running and your gauges are showing low side pressure too low and warm air is coming out Is there any resistance? Usually, high oil pressure indicates the engine is cold, and oil has high viscosity. Mr. Rubel is an Engine Mechanic. 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. ", 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. 3 (2010): 510-520. JavaScript is disabled. When the proper pressure is reached, the vents blow warm air and the compressor drops out. Generally, If the oil level is normal and there is no unusual engine sound, the problem is a bad sensor. Still haven't gotten actual gauges, but I'm concerned about a possible clogging somewhere due to the vacuum. A low pressure cut-off will prevent the Engine coolant levels will be low. 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. This could be normal if outdoor temps are very low. The car is a 2006 Hyundai Accent. I evacuated the system to get ready to add 134a. It has a new compressor, orifice tube, and accumulator. The system is probably leaking. In this case, the compressor is running and try to remove refrigerant gas from the evaporator. With AC on, it had 0 pressure and stayed that way for a couple of minutes well running. If your car has a heater valve, make sure its not allowing hot coolant into the heater core when youre running the AC. Is the cooling fan running constantly? international journal of refrigeration 33, no. Open the low side valve on the manifold gauge set. 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? I did this 2 times and pressure is the on the low and high? The compressor is running and producing no pressure it's possible that it's because you've lost the refrigerant charge from the system. Should be a tag on the radiator support. Keep a check for external oil leaks; it can cause oil drops. Start the engine and turn on the air conditioner. Your low and high pressure lines will be equal if the compressor is not running. new install. If you missed part I, start here. 1. Open the low side valve on the manifold gauge set. Whats likely the culprit? Low side is way to high. Check the ambient temperature and see if the pressures match the numbers on the pressure chart. What is the normal head pressure for a 2 ton heat pump? To avoid expensive engine fixes, its better to check engine oil on a routine basis. 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. Usually, to use a belt without ac, you need to remove the compressor as if it didn't have ac. Pressure that is too much lower or higher shows there is a problem. "Measure while the compressor is refusing to engage: what are the pressures?' What would be the cause. Regular maintenance can avoid oil leakage problems.
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