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"Your two most obvious answers would be either a bad thermostat, or a bad water pump." These are two possible problems. Does the car only over heat when idling in traffic for instance? If so does turning on the A/C make it cool down? If this the case you may have a bad fan switch which is actually more likely. A bad fan switch will not turn on the electric cooling fan when it should. Turning on the A/C forces the fan to come on regardless of what input the fan switch is giving.

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17y ago

What else can I help you with?