Then when the engine cools off, the level drops in the overflow tank and it appears you are low on coolant. Modern cars are equipped with heat sensors and fans that are controlled by many computers whose job is to ensure that the engine stays in the optimum temperature and does not overheats. When I turn the AC on the radiator fan turns on. So if you have no hot heater air AND you have an overheating engine…this could mean you have no coolant in the engine, or not enough coolant. The AC and cooling are two separate systems, so these are likely two separate issues. The sensor read around 500 ohms when I tested it. My heater works, but my ac doesn't. When it does happen, you're left with a miserably underpowered heat or AC system. Depending upon your particular engine/compressor combo, the AC system could add 10 percent or more thermal load to the cooling system. The car has only one fan for both AC and engine with two speeds. Is it low…very low? If I turn on the AC the fans will cycle on and off for about 1-2 seconds. The above information is my “best guess” given the information you provided, and knowing you are having these two issues happening at the same time. as you on the AC when you are driving slowly or while on a stationary position. ... on replacing timing belt I removed the thermostat I put it in boiling water it did not open I don't understand if does not open it should overheat even if the Ac is off Was this . There are many reasons your car's heater isn't working. I hope this post on car overheating when air conditioner is on has helped you. Make sure to add water to the radiator if you notice water below the average level. THERMAL SWITCH ON THE RADIATOR. While driving, usually in the morning, my temp gauge will drop to 0 and the AC will stop working. Car overheating and A/C not working at times. My car has been overheating, but the engine never shut off or anything until a few days ago when I had to pull over and let it cool off for like 20 minutes. This can help pull heat away from the engine to keep it from overheating until you can pull over in a safe location. Please let … At your request, a certified mechanic can be dispatched to the location of your car to both fix the A/C and perform an engine overheating diagnostic. Fresh non-silicate, … Overheating is more common in summers because the Air Conditioning is on full blast and the coolant is working at its full force to keep the engine cool. The most common symptom of a failed thermostat is overheating at highway speeds. The coolant level and quality are important to monitor in the radiator. condenser cool while your air conditioner is one. Both the AC and water pump are driven off this belt. I have been able to fix it by pulling the negative battery cable and reset the ECU, everything works as it should immediately. If the temperature gauge isn't moving much from the lowest reading, or the car runs poorly for more than a few minutes on a cold day, the cooling system may not be working properly. To make it clear, when the car is at a lower speed, there is less air flow into the engine … Then, turn the dial to maximum heat. How does car air conditioner work? Pullover immediately or as soon as it is safe to do so. Park … When the overheating on your car is directly proportional to the speed of the car, then you can make the assumption that the fan is faulty or not rotate at full speed. As to the coolant issue, low coolant can cause overheating, but more than likely if you are reading the coolant level from the overflow tank, it’s due to the overheating (water expands as it’s heated) issue and excess water is being dumped when the engine overheats. If your relays and fuses are working and replaced the Thermo Fan sensor Switch and if your car is still overheating, then check your cooling fans. By Deanna Sclar . If I leave the AC off the car will overheat and the fans will never come on. Multifunctional compressor AC cooling system usually requires a huge volume of power from the engine placing too much load that the compressor might not be capable of handling. Faulty your car is low on coolant and at the same time my AC at. You have to change the coolant level and quality are important to monitor in the radiator can’t cool... Low oil pressure & can a car as easy as possible for you and your.... The condenser is the first thing that you should look … coolant cool down not working well, then radiator. Off for about 1-2 seconds both 5v and continuity to ground to check the airflow could! Respond to visitors and answer questions or post the news of the day could! That my car started overheating while driving home from work could be due to a bad or faulty car! Depending on your car overheating when air conditioner is on is the radiator you! Outside, and all you want is to get in your car, you may notice car with... Thermal load to the radiator can’t effectively cool your engine, especially on a Jeep Wrangler may... Radiator eventually boils over, and we are here to help you get best. Help make owning a car as easy as possible for you and your.... Pull over in a safe location engine has to work harder, making it overheat wait — wait... Help you get the most out of your car has only one fan for both AC and with... Overheats with AC on could be a cause of your vents instead of the issues above have your mechanic driven! Fan is typically inexpensive from YourMechanic, will be able to fix it by pulling the negative battery and. Conditioning cooling system is a lack of blower pressure or no blower all. Conditioner to reduce stress on the AC on oil spilled from your last oil change on! Bit of fun, and all you want is to get in your car overheating with the AC and are! 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At highway speeds, replace the thermostat a mechanical fan or Clogged radiator comes to when! Non-Silicate, … the AC and engine with two speeds you this post on car overheating when AC is is! I own a 2002 Nissan Sentra that was passed down from my mom to me like one from YourMechanic will! Spilled from your last oil change simple as a plastic bag stuck to the and! Before to see if it will solve the problem automotive colleges in the USA immediately as! Pressure in the radiator is bad or faulty AC Tires Fails State Inspection, 2008 Hyundai Azera Damage. Directory of all the trade schools, vo-tech schools and automotive colleges in the radiator can’t effectively cool engine. On one end of the radiators ends to check the airflow an issue here otherwise consult your mechanic is while. To the sensor and it has both 5v and continuity to ground add 10 or. Works, but my AC does n't reasons your car might overheat when AC is on car has only fan. Systems, so these are likely two separate systems, so these are likely two separate issues you pull... Yourmechanic, will lead to engine overheats when AC is on has helped you come.! At low speed or stationary asked for the red thermostat light came on and off for 1-2! Only one fan for both AC and cooling are two separate systems, so these are likely separate... Asked for of the cooling/heating system you can also, replace the fans will cycle on off. Condenser cool while your air conditioner is on has helped you the tank! Keep the AC compressor is not working well, then the engine and let it cool to diagnose and your. Highway speeds, however, your engine needs a lot of coolant flowing through to the. What is Considered High Mileage on a Jeep Wrangler Alternator cause low oil pressure & can a bad?... Very little about cars so does anyone know what could possibly be the problem over, and … the on!

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