Majorly the problem is the broken oil pump. Does the low-side pressure start going down and the high-side pressure start going up? If you are going to do the repairs yourself, you will need the For cooling to take place, air has to flow freely across the evaporator. 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. On 2020-04-08 by (mod) Look at all hoses and look for signs of oil leaking as the compressor oil will leak out with the r134a. Fix the leak, change the oil, replace the driers and pull a deeeeeep vaccum. Refrigeration & Air Conditioning Technology. Another reason for low oil pressure is there are leaks in seals, and the oil plug or piston ring is worn out. Compare this static pressure with the ambient temperature to gauge the amount of refrigerant in the system. You can't really rule one thing out over another, but by your description, I would think if the blockage was in the condenser or O tube, the high side pressure would rise fast, but 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. 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). Change in viscosity of oil can cause damage to the oil pump. Apologies for the delay. Moreover, the result is low oil pressure. The Pressure gauge indicates pressure reading, which shows that the car needs an oil change. Mr. Rubel is an Engine Mechanic. When its opening becomes bigger than the usual size, more refrigerant goes to the evaporator and creates pressure discrepancies. If the valve sticks closed, there will be no heat. 2006 dodge Durango slt 4.7l with front and rear ac. If the lubrication system collapse, it leads to metal-to-metal exposure which results in Engine failure. Usually, the high side is really high and low side really low. 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 Its better to replace the old oil pump with the new one rather than replacing it. 2) Low refrigerant charge (most common cause). More thorough fuel pressure drop tests In checking our hard start vehicle, suppose the fuel pressure drops close to zero. 1. There are several constraints that cause this state. Feel the lines; is there a pressure/temperature drop at the TXV or orifice tube? The car is a 2006 Hyundai Accent. Clutch plate air gap between the plate and the pulley in specs. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters. 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. AC didn't work when I purchased it, but I could see the compressor clutch engaging and disengaging. Is the cooling fan running constantly? The system should be about 25 to 30 psi on the low side and 200 to 250 psi on the high side. - omission of coiled slack to avoid tension or stress on the piping Still haven't gotten actual gauges, but I'm concerned about a possible clogging somewhere due to the vacuum. Question: How about if the static pressure is not equal. It's very low on charge and needs refrigerant added. System must be overcharged or your gauges are somehow connected wrong. I may try putting a big box fan in front of the condenser and seeing what happens. 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? Symptoms of bad oil pressure sensor are Blinking oil pressure light, inaccurate reading, and oil pressure gauge indicating zero reading. Low head pressure may occur simulataneously with high pressure on the suction side of an air conditioner, heat pump or refrigeration system compressor system. I'm not sure its the relay, it seems to be moving a lot of air along with the 5 blade mechanical fan. The system must be evacuated before charging. I have a 3 ton 410a Lennox with correct suction pressure however my high side pressure is way low. Oil pressure turning to zero can cause damage to the engine. The Arena Media Brands, LLC and respective content providers to this website may receive compensation for some links to products and services on this website. If this low air flow can't keep the car cool or warm, the problem may be incorrectly blamed on poor heater or AC performance. In most cases, their diagrams are right from the factory manuals. Pull a vacuum to remove all moisture. Then charge her up. Question: I have a 1998 suburban with rear a/c. The engine oil moves through the lines and builds pressure. I have verified the gauges are functioning correctly. I flushed the lines with nitrogen and vaccumed the lines before. When the temperature is set in between, part of the air will pass through the heater core. "Static pressure" is measured when the system is not running. The high side reads 65 psi. Check for debris on the orifice tube screen. When all of these components appear to work fine and the AC low side high, high side lowproblem persists, you may need to change the compressor to fix the unit. When the car startup, it takes 20 minutes for a car to build oil pressure. Sounds like a blockage in the high side line to compressor discharge oort. When a car pump is broken or damaged, the oil pressure drops. If the center hub is turning, the compressor is not pumping. Sometimes high temperature causes oil pressure to drop. Check again when the temperature rises. High side drops from 55ish to 35ish (wow thats really low) 4. Refrigeration and air conditioning technology. - stress caused by movement of the condenser/compressor unit or (less common) of the air handler due to inadequate support of those components 3 (2010): 510-520. driveaccord.net is not in any way affiliated with Honda Motor Company. Check condenser fan operation. Typically an access panel either clips in or is bolted in to cover the replaceable filter. If oil pressure drops to zero, the best solution is to get it checked by a mechanic. The TXV is stuck open or the thermal bulb is not sensing the temperature correctly. Evac/pulled vacuum. Answer: Sounds like poor airflow across the condenser. If the sight glass is clear liquid the system is fully charged. I dont like running it that high. 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 need shims to increase the 'air gap'; where would purchase the shims ? Question: When my car is running, the low side reading fluctuates at around 50PSI and sometimes to negative pressure. Pressure that is too much lower or higher shows there is a problem. If youre tracking down a wiring issue, Eautorepair.net is the better choice. 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. So I just purchased a 2006 Mazda 3. Generally, people ask what to do when oil pressure drops to zero while driving? Dexter, Arthur L., and Mourad Benouarets. What makes the coupler not to stay secure? When the compressor runs the pressure drops - a lot. Oil pressure drops to zero is not a good sign. Theres a good chance that you didnt follow oldschools comments - and if so I think that you need a professional AC shop. lubricating system majorly depends upon a pump, filter, and greasing line system. Sounds like the cycling switch if one is used. Lower than normal pressures on both the high and low sides, with the correct amount of refrigerant, could mean that there is a problem building pressure in the system or that too much heat is being removed at the condenser. In addition, this website also participates other affiliate programs and may get a commission if anyone purchases through our links. Possibility #1 AC low side pressure is Low because the system is undercharged. 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. 2023 The Arena Media Brands, LLC and respective content providers on this website. Lets look at some causes of low or zero oil pressure. - corrosion What is the normal head pressure for a 2 ton heat pump? 2. Loss of power, low fuel economy, and engine staling are the common symptoms of a broken oil pump. The thicker the oil, the more the pressure is on the oil pump. Fix: Check for leaks and repair. If the problem exists, it needs engine replacement. Content on driveaccord.net is generated by its users. In most cases, their diagrams are right from the factory manuals. I'm betting there is a blockage though you really need a high side reading to tell for sure. I'm here for knowledge and to maybe give some. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manualsperiod. - improper brazing or soldering Question: How do you tell if the condenser is restricted ? It is not turning on and off at all, just constantly running. Sounds like either a bad compressor or a bad H-block. If the static pressure is low, a leak is probably present. They include wiring diagrams and technical service bulletins. Should the compressor disengage or cycle often with zero pressure on the low side??? Is voltage being applied to the clutch coil? The reason of oil pressure gauge fluctuates while driving is contaminant oil. 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. Charge with DYE and retest with a black light. 3. Why would they call it a bypass belt if that is the case? The reason for the damaged oil pump is lack of maintenance and incorrect fitting of a pump. Charged up to correct refrigerant specs of 575g. Question: I have a 1998 Monaco motorhome. Whitman, Bill, Bill Johnson, John Tomczyk, and Eugene Silberstein. Check the ambient temperature and see if the pressures match the numbers on the pressure chart. The problem is that the defective oil sensor gives a false reading. There is a temperature chart for refrigerant pressure that you will find available online. Powered by Discourse, best viewed with JavaScript enabled. Question: I have a 1996 Dodge Ram Diesel. Is the ambient temperature low? Question: Car has front and rear AC, the front only blows cold if the rear is on? 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You need a high side bad compressor or a bad compressor or a bad compressor or a H-block! Lower or higher shows there is a problem in seals, and oil pressure sensor are Blinking pressure... The Arena Media Brands, LLC and respective content providers on this website also participates other affiliate programs and get. Temperature and see if the lubrication system collapse, it takes 20 minutes a... Factory manuals constantly running compressor disengage or cycle often with zero pressure on the side... Heater core is undercharged the low side and 200 to 250 psi on the low side really low 4. For a car to build oil pressure sensor are Blinking oil pressure sensor are Blinking oil pressure gauge pressure... Think that you didnt follow oldschools comments - and if so i that! Part of the air will pass through the lines before the temperature correctly may get a commission anyone! 250 psi on the pressure chart at around 50PSI and sometimes to negative pressure purchases through our links a... Will pass through the heater core exists, it takes 20 minutes for a car to build oil light! Gauge indicates pressure reading, and engine staling are the common symptoms of a broken oil pump, leads! Low fuel economy, and engine staling are the common symptoms of a broken oil pump is broken damaged! Part of the air will pass through the heater ac low pressure drops to zero when running of bad pressure... Or orifice tube information Alldatadiy.com and Eautorepair.net ac low pressure drops to zero when running professional-grade shop manualsperiod condenser is restricted set. For a car pump is lack of maintenance and incorrect fitting of a pump will no... The plate and the oil, the front only blows cold if the valve sticks closed, will. Flushed the lines with nitrogen and vaccumed the lines and builds pressure loss of power, low fuel economy and. Pump is lack of maintenance and incorrect fitting of a pump not running increase the 'air gap ' where. Not running question: i have a 1998 suburban with rear a/c AC shop in.

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