[A26B]

Originally Posted by VetteMed

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Sammy's mention about the aftermarket temp sensor is interesting. I did replace the OEM sensor with an aftermarket. However, the one I replaced was the one-terminal "button" connector arrangement, not the 2-wire weatherpack connector. I "assume" that the one-terminal sensor is for the gauge, while the 2-terminal is for the ECM?

Edit: looks like my ASSumption was correct, the sensor I replaced controls the dash gauge. So that most likely is the reason for the perceived warmer temps. I'll have access to a scan tool next week, and I'll try to determine what the ECM is seeing so that I have a mental framework for comparison to the dash gauge readings.

You are correct, the single, button terminal provides coolant temp signal for the gauge & the other 2 terminal sensor provides signal for the ECM & the cooling fans.

I have a 94 which is different, but doesn't yours also give you a digital readout by pushing a couple of buttons? may be in centigrade but at least you could tell what the other sender is reading through the ECM. The scan tool will be reading the same thing.


Someone with a 90~92 could offer some input here.