Engine metal temperature sensor
That reminds me of a sensor that Ive seen before on other GM cars. It senses metal temperature. It may have something to do with a delay for the blower motor if the temperatures are too cold, The blower does not turn on for a time to wait until you at least have some hot water going into the heater core.
It works in combination with a relay.
That, or it may have something to do with the AC compressor. Not allowing it to turn on if the temperatures are below freezing?
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Peter Serio
Owner, Precision Pontiac
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