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Obviously your engine should not overheat with simply turning on the AC so this would indicate that you are having problems with your cooling system. When the AC is turned on there becomes another drag on the engine due to the AC compressor being driven by the serpentine belt.

I'd recommend checking your antifreeze level and looking to see if you have a leak from the radiator or a hose. Several other things to think about in relation to engine overheating are a stuck thermostat or possibly a plugged radiator.

Engine overheating issues never go away and will probably get worse. Major engine damage can result if the engine is run hot for very long so I'd have this checked out at a reputable radiator shop as soon as possible.

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Q: Why your engine overheated when you turn on the ac?
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