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2003 Pontiac grand prix no heat the temp goes up and then all the way down and then you get heat?
Wiki User
∙ 9y ago
A malfunctioning thermostat can cause your temperature gauge to go up and then allow the gauge to go all the way down. When the thermostat is stuck closed, your engine will overheat and water will not get to your heater core. When the thermostat opens the engine cools down and water flows to the heater core.
Wiki User
∙ 9y ago
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