We probably all know that you can choose a thermostat that opens and closes at several temperature combinations. My L24 FSM says the stat should open (and close) at 180 F. Fine and dandy.

But now I'm putting a 3.1 L stroker motor in my car and adding a Vintage Air A/C system and a 2450 CFM Perma-Cool electric fan as well. So, I need to get a thermal switch to operate the fan (which will also be activated by the trinary switch on the A/C system).

Assuming that a 180 F turn on temp is OK for the stroker, the question is at what temp should the switch turn off and is that even important? Almost every switch I see online has a 165 F turn off point. I presume that is fine because any running engine should be at about 180 F when it gets turned off and the fan would be running.

But I want to check with folks more expert in these matters and that's you fine people. Am I worrying about nothing?

Are you trying to trigger it from your thermo housing?