A little background, My father in law gave me a 1990 4runner (3.slo) that had been sitting since 2005 with a Blown head gasket. I just replaced the motor with a re-manufactured long block and it runs great so far other than being a total dog... My last SUV was a 400hp trailblazer SS so maybe I'm spoiled.

Anyway, my issue is that I just went outside and after being turned off for the last 4 hours the AC fan was on. The ignition is off, the doors are closed. I turned the truck on and turned it off and the fan was still running. I then closed the hood and it turned off...

I read somewhere that the fan has constant power even with the ignition is off, but what triggers it to switch on?

 

What do you mean by A/C fan?

Do you mean the one on the rad?

 

The condensor fan, the electric one right behind the grill.