you cannot run a electric fan in a 5.0 with the stock 75amp alternator, the car doesnt produce enough voltage to keep the computer happy or any of the other electrical systems. toss the celica fan and install a 94-95 mustang gt 130 alternator if you'd like to keep an electric fan set up, if not just put a clutch fan back in.

if you do the alt. go with the PA performance wire kit, i used it with great results and its a symple install

also make sure you run a 85amp relay with the electric fan if you go that route
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