Quote:
Originally Posted by mults
To me, it sounds like air in the system. ... If there is heat when driving and none when you stop, there is not enough coolant to reach the heater core.
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Quote:
Originally Posted by Jinxx
Most of the time air in the system will run hot ....
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The engine will usually run hot but flow to the heater core can be blocked by air pockets, especially when the water pump is at low speed. The coolant in the core cools off quickly when flow is lost.