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First make sure you have the correct temp thermostat for your car. If you went with a cooler one, your heater won't work correctly. If you have the right thermostat, you probably have a bad heater control valve or your adjusting cable isn't connected. Check those things out. Your heater core could also be bad.............if the car is not overheating any more I would check that.

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Q: Your temperature gauge would go sraight to hot when you would start your car so you was told to change the thermostat Now when you turn on your heater it just stays cold How do you get your heater to?
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