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Why Is My Car Overheating When The AC Is On?

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Why Is My Car Overheating When The AC Is On?

Imagine you are driving on a hot summer day but suddenly your car starts overheating and you can’t use the AC anymore. How inconvenient would that be! Air-conditioning (AC) is one of the many features of a car to make commuting comfortable and is used almost always irrespective of the weather if it’s hot, cold, raining or snowing. But in several cases, drivers have complained of overheating due to AC usage. Why does it happen? At Onehowto, we explain the possible reasons for why your car is overheating when the AC is on.


You may also be interested in: Why Is my Car Thermostat Going up and down

Why Is The Car Overheating?

There are several reasons why your AC is overheating your car, here are the most lightly causes:

  • Inefficient functioning of the cooling system is one of the most common reasons for an overheated car. The reason for that could be as simple as a leak in the radiator which requires water to be refilled at short intervals. The tubes of the radiator corrode with time. Though the coolant has corrosion inhibitors added to it and help prevent such occurrences initially, over time it becomes ineffective.


  • It is very common for car to get overheated when at low speeds or when stationary in traffic. This is due to lack of airflow through the radiator. This can be taken care of by fixing the faulty electric fan assembly, fan clutch or fan switch. The radiator must also not be obstructed by trash or leaves.


  • Sometimes, if an air-conditioning gas is not suitable for a particular type of vehicle and is used, it can cause inefficient cooling .


  • Direction of air flow from outside towards the engine can play a role in overheating. This happens if hot air flows instead of cold and the engine draws in the hot air causing the overheating.
  • A malfunctioning thermostat is also a likely reason for overheating while the car is running at a regular speed. The causes could be damaged radiator, faulty radiator cap or lower level of coolant needed. Take a look at how often a radiator should be flushed for more information on the subject.



Why Is The Car Overheating?

What To Do?

If you face the overheating problem while driving, first stop the car, turn on the heater on full blast so that the heat is pulled out from the coolant to the ambient air of the car. You might want to step out of the car when doing this. Next, turn off the AC. Idle the engine for a couple of minutes and then finally turn off the engine. Try and sort out any issue from the above pointers that can be fixed right away. If you are not able to do this, turn in the car to the nearest service center you can find. Needless to say, keep the AC switched off while driving to the service station.

To avoid overheating issues, there are few golden rules to follow like, using the right coolant for the car model you own, using a superior quality thermostat and always using distilled water instead of regular water. For someone who’s not into too much mechanical stuff, just get your car serviced on time and look for early signs of overheating problems before it catches you off guard.

Take a look at how to recharge your car air conditioning system at home if you want to give your car a fresh start.

If you want to read similar articles to Why Is My Car Overheating When The AC Is On?, we recommend you visit our Car Maintenance and Repair category.

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Why Is My Car Overheating When The AC Is On?