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Heating AC and Engine Cooling
Heater Cores and Blower Fans
Jeep Grand Cherokee Limited
Car Heaters

What is the reason for a car's heater to work properly one moment and then not work at all the next?


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Answered 2011-09-15 10:05:58

I would check the coolant level first. When the coolant drops below a certain point,Warm coolant that makes the heater work is no longer present and all you get is cold air. If this doesn't work, I'd try a "hotter" thermostat.

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