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check the coolant mix should be 50/50 if you do not have 50/50 coolant and water it could cause problems also take a hose and clean the radiator of anything that may be blocking the flow of air through the radiator if this does not work see if the fans are running if they are then take the car to a mechanic and ask them to pressure test the head shord only cost about $20. ALSO it might be our head gasket. mine did that too When the A/C is on the engine has more of a load on it due to it have to now also turn the a/c compressor, since the engine is working harder with the a/c on it will overheat faster

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โˆ™ 2009-05-08 20:05:55
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Q: Why does a Dodge Neon overheat and get worse when the AC is on?
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It uses R134a.

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It is way to the passenger side of the radiator, near the ac comp.

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