• Engine overheating with AC on is generally caused by one of two possibilities. One, is increased engine load caused by a failing AC compressor. Plugged or blocked radiator condenser fins, fans not working efficiently or a water pump that is not circulating coolant could all cause overheating with AC on only.


  • A car AC compressor can cause overheating of the car engine. If the compressor has seized up then the fan belt may not be moving freely, which in turn would affect the cooling system. The fan regulates and distributes the heat keeping the temperature in check. Ensure that the water pump is also working effectively.

    Additionally, does AC make engine hotter? Automotive air conditioning (AC) will cause the engine to run hotter in the summer because it creates more heat in the engine compartment and there will be more strain on the engine to operate the AC compressor. Every time it cycles on it creates more strain on the engine and in turn will create heat.

    People also ask, why does my car overheat when AC is off?

    Inefficient working of the cooling system As the AC system moves refrigerant to the condenser, the engine fan blows over the condenser fins to regulate temperature. If the fins are clogged, the condenser temperature will rise. If the condenser gets too hot, it can lead to the engine overheating.

    How can I cool my car with a broken AC?

    4 Tips on how to cool your car without AC

    1. Ensure that your car is properly ventilated.
    2. Leave your windows slightly open while parked.
    3. Plan to travel when its cooler outside.
    4. Place a wet cloth or ice pack at the front of the vents.
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