ac low pressure drops to zero when running

Both gauges are reading zero. 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. 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? In this article series we explain how overcharging or undercharging of refrigerant in an air conditioner or heat pump is detected and we list the effects of overcharged or undercharged refrigerant. 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. Oil pumps circulate oil throughout the engine. Applied Thermal Engineering 17, no. Sometimes the readings youre receiving on the gauge can be accurate yet the ACs pressure might not be up to accurate. Fix: Remove excess refrigerant or evacuate and recharge with the correct amount. The TXV is stuck open or the thermal bulb is not sensing the temperature correctly. Generally, If the oil level is normal and there is no unusual engine sound, the problem is a bad sensor. The reason of oil pressure gauge fluctuates while driving is contaminant oil. If the system is properly charged it seems the compressor is not working up to par. Delmar Thomson Learning, 2009. One symptom indicating a complication in the air conditioning is AC low side high, high side lowpressure. Air Conditioning (AC) System Operation with TXV or Orifice Tube. I would do an evacuate and recharge first, then do a pressure check. PSI was around 60 off and 0 when on. 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. Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the. There are tools that will replace the valve cores with no r134a refrigerant loss. 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. Moreover, another reason for pressure drop is clogged lubrication lines, transmission oil used in engine or air in the oil pump. What is the normal head pressure for a 2 ton heat pump? If the oil has impurities, it requires an oil pump to build more pressure. Lets understand what 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 Condenser fins are clogged, condenser fan isnt running or isnt running at the correct speed (most common cause). No hot water valve is needed because in cool mode the door closes off airflow through the heater core. If the sight glass is clear liquid the system is fully charged. Clutch plate air gap between the plate and the pulley in specs. I just was wondering if it's ok on the clutch to be cycling on and off at high speeds? You will notice blue smoke coming out from your car exhaust. As soon as clutch disengages, pressure goes That saves a lot of time because you dont have to refer back to the component locator or circuit locations. Any thoughts? I flushed the lines with nitrogen and vaccumed the lines before. Ltd., 2010. Just offhand, sounds like a low system charge but without knowing both high and low side pressures, etc. If you need to dig into your doors, dash or console, Alldatadiy.com is the better choice because Eautorepair.net doesnt any interior or exterior trim or body part removal. I pulled a vacuum on the system prior to charging. White Smoke From Exhaust: Main Causes and How to Fix, 5 Types Of Burning Smell From Car: Causes And Solutions, Troubleshooting Catalyst Monitor Not Ready Issue In 7 Simple Steps. Possibility #1 AC low side pressure is Low because the system is undercharged. Question: How do you tell if the condenser is restricted ? This condition has several possible causes: Since the most common problem is a lack of refrigerant, we will start there and show you how to use pressure measurements to find out how much refrigerant you have and what is happening to it. Lower pressures may indicate low refrigerant level or a weak compressor. Answer: 2020 Mustang should be R1234yf refrigerant. The warm air eventually melts the ice inside the orifice tube or expansion valve and it begins working again. Is the cooling fan running constantly? After the system runs for a while, raise the RPMs up to about 1,500. What happens when the system runs, do the gauges both move? Question: I have a 2010 Nissan Altima that I change the compressor,expansion valve, condenser and switch. However, a radiator leak can occur if one of these components goes bad. 2. Could the compressor clutch be partially sticking? Whats likely the culprit? Answer: The computer senses the extra load added by the power steering and turns off the ac until the load is reduced. 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. Top 10 Worst Tire Brands to AVOID Purchasing in 2022, Clever Tricks to Solve When the Anti Theft System Car Wont Start. Thanks for the input madmatt. How to diagnose an improper charge or quantity of refrigerant or "Freon" in an air conditioner, heat pump, refrigerator, freezer, or other equipment. international journal of refrigeration 33, no. 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. Cengage Learning, 2012. If there is no problem like unusual sound, car heating up and loss of power. driveaccord.net is not in any way affiliated with Honda Motor Company. Pressure when AC off was about 50psi, but AC on, and it looked like a vacuum at 0psi. The blockage or stuck expansion valve restricts the flow of refrigerant into and out of the evaporator. Any input based off the above symptoms? 1. So replacing the defective pump or gauge will be a good idea. I installed a new rheem 3ton 16 seer ac system and when I kicked the system on the suction pressure dropped 3) Partial blockage of the orifice tube/expansion valve and the evaporator. Low side pressure was between 80-90 at idle. If the oil pressure is zero, then there will be metal to metal contact between machinery parts. Is there a possibility of a leak based off the gauge readings? Shut the engine off and rotate the center hub by hand. Answer: Sounds like you have a leak. Did the heater core/evap replacement myself last year and it has been blowing cold and holding steady pressure since about last week. If the cabin filter is dirty, the result will be low airflow. The effects of poor oil return to the compressor include first reduced cooling capacity and later damage to the compressor motor. We have no relationship with advertisers, products, or services discussed at this website. Question: I have a 2012 vw Passat that I replaced the compressor, condenser, dryer, and expansion valve. Wanted to post an update, I did all this last friday night. I have to bypass with the belt. If your car has a heater valve, make sure its not allowing hot coolant into the heater core when youre running the AC. If the reading is normal, replace the sensor. 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. Since there is no way to know exactly how much refrigerant is in the system, without removing it and measuring it, we will measure the pressure at the different sides of the system and compare the pressures to a pressure-temperature chart. Bump, still looking for a response. However, it is always better to consult a mechanic before deciding to replace any part. Low side drops to Theres a good chance that you didnt follow oldschools comments - and if so I think that you need a professional AC shop. Answer: Never seen this before. Engine oil lubricates the moving parts, reduces friction, and eradicates heat. The system is probably leaking. That saves a lot of time because you dont have to refer back to the component locator or circuit locations. AWD Tire Replacement Myth: Shall You Change All Four Tires? 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. They include wiring diagrams and technical service bulletins. 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. Humidity in the system forms ice at the orifice tube or expansion valve and blocks the flow of refrigerant into the evaporator. It is a key indication of a faulty oil pump. 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. 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? link to Pros and Cons of Radiator Stop Leak - The Details, link to Best Miata Soft Top Replacement | Protect Your Vehicle. Please bookmark this page to make it easy for you to check back for our response. Check again when the temperature rises. Update, tried to add some of that refrigerant AC-PRO stuff. This could be normal if outdoor temps are very low. Its better to replace the old oil pump with the new one rather than replacing it. You can measure the refrigerants pressure at a given temperature. Low side is way to high. 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. Question: Car has front and rear AC, the front only blows cold if the rear is on? 2006 dodge Durango slt 4.7l with front and rear ac. 7 Reasons Why Your Car Shuts Off While Driving and What To Do. Both of the schrader valves are leaking. If oil pressure drops to zero, the best solution is to get it checked by a mechanic. 1. Perform a visual check to see if the compressor is running. Is that normal? High side of gauge reading zero, but the cab is cool. If LOW side drops, like 0, it turns off High side was about 250. A clogged filter leads to extended oil and thus result in poor combustion. 1. HubPages is a registered trademark of The Arena Platform, Inc. Other product and company names shown may be trademarks of their respective owners. The AC and heater operate out of the same box or plenum typically under the dash. What are the effects of low refrigerant pressure at the compressor or in the system? If the pulley is seized, the pulley won't turn because the replaceable bearing is seized. The AC Heater box or plenum is located under the dash. Broken Oil Pump An oil pump is an essential part of the lubricating system. If the ambient temperature is higher or lower than normal (70 to 80F) the pressures will go up or down accordingly. For a better experience, please enable JavaScript in your browser before proceeding. Lets look at some causes of low or zero oil pressure. "Natural refrigerants for refrigeration and air-conditioning systems." A pressure switch or sensor could be bad. Lets look at some causes of low or zero oil pressure. I am sure it will cycle if all that is wrong is low freon. A forum community dedicated to Mazda 3 and all Mazda vehicle owners and enthusiasts. The Reasons for AC Low Side High, High Side Low Pressure, A Safe and Secure Way to Flush AC System After Compressor Failure. 1 (1997): 33-42. Im completely stuck. Oil pumps circulate oil throughout the engine. Answer: If the compressor seized, the pulley should still turn. 7 Causes Of Car AC Low Side Pressure Zero. Charge system until gauges read over 50 pounds of Here are two companion articles you will find useful if you repair AC systems. Start the engine and turn on the air conditioner. Adjust your Low Pressure control to stop before it hit 0 psi. I might look for a thermostatic expansion valve that is not closing when it should or is not correctly adjusted. Question: Why does the ac cut off every time I make a turn? Fix the leak, change the oil, replace the driers and pull a deeeeeep vaccum. 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