I'm going to the junkyard friday to get a pigtail and I wanted to know if anyone knew if there was any other cars that used the same pigtail for the thermal temperature switch for the fan. Just incase I can't find any thirdgens with the wire still there.

 

The thermal switch is pretty uncommon among GM vehicles but the connector is on almost every car somewhere. Usually you'll find it with a blue wire on the knock sensor. Pretty much all GM's used is from the mid 80's to mid 90's