I found an open broken pressure switch on the ac condenser that was causing the fan to stay on. There is several of these normally closed switches on the a/c and temp sensor and then there is the solenoid itself the one that gives air pressure to the fan clutch. The simple way to start is just to jump these switches to check them and hot wire the air solenoid to see if it turns on and off. This is the easiest way to eliminate these things. You will very likely find a broken sensor or wire like what happened to me.
Fan clutch stays on.
in Engine and Transmission
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