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First you need to make sure it is actually not heating up. Do this by checking to see if the radiator hoses are getting warm after running for 10-15 min. Be careful they could be HOT. If the hoses are hot then the heater core is plugged and will need to be replaced. If hoses do in fact not get hot then the thermostat is most likely stuck open. removing it will tell the tale.

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9y ago
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Q: What causes your car not to heat up?
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