ANSWERS: 3
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i would change your thermostat and more then likely u need to flush your radiator and add new coolant
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Could be as simple as low coolent. Check the level in the plastic bottle. Be careful and don't open the radiator when it's warm.
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The heat and defrost are two different systems. The defrost works off your A/c. It may be cold for a period of time until the warm air can circulate into the system. High heat on gauge start with the basics antifreeze level. Mr. Bill
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