My Chevy Dealer's mechanic cut an AUX wire from my ECM to my (single) fan, and I'm wondering if i need it. Do 3rd gens (and my '91 in particular) have a circuit that keeps the fan on after ignition is turned off, if engine heats up after being turned off?

Dont believe so, fan should only run when the key is on.If the fan is running when the ign is switched off the fan should stop.

Thank you.