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Q: overheats on 1991 Chevrolet Cavalier

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have new radiator, hoses ok, new thermostat but car overheats. If I run the heater it cools it down a lot
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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check the type of coolant u have they recommend dexcool for all gm vechicles and its the orange color not the green color coolant plus check the fan operation and if thts not it burp the system or flush the system it could be clogged
same problem..new fuel pump wire harness or fuel pump..make sure you have the fuse for the heater first
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