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There is no relay. There is an electrically controlled temp door motor that runs the door directing the air flow, either across the heater core, or across the evaporator core, or any degree in between. That motor sometmes fails, and that blend dorr likes to break. I have a feeling you will need a heater case, because the door is part of the assembly.

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โˆ™ 2006-03-27 14:02:41
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Q: If the coolant isn't circulating through the heater causing for little heat temperature what is the problem?
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