There is another sensor very similar to that one only it senses air temperature. It was behind the glovebox on 1978 and 1979 GM cars. and I recall it held back power from going to the blower motor during very cold start ups. I do recall seeing them, it had 2 flat tabs on it that plug into the dash wiring harness. It was never connected to anything except the wiring plug-in and those were always inside of the car. It just got a sense of really cold air temp or not, for it to delay + power to the blower motor the car would have had to be parked outside overnight in below freezing temperatures.
I can't recall one of those sensors ever going bad but I am pretty sure it must have given some time, maybe 5 or 10 minutes for the coolant to warm up. It's been a long time since Ive seen one.
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Peter Serio
Owner, Precision Pontiac
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