ftpiercecracker1

The sensor on mine is located on the driver side of the engine block, just above the engine mount, and its brand new, replaced it last night. I think the problem lies somewhere between the relay and sensor (ground?), i will have to trace it to find out. I know the relay is good, because the fan does kick on each time the a/c is turned on. Would you happen to know what temp it requires for the aux fan to kick on? I drove the truck today on some back roads and mild trails and it never got above 212*, but the fan never kicked on. By the way, the rad is one year old, same with the pump, and the t-stat is brand new, replaced it last night as well. Fan clutch is good as well, pulls hard.

1990, eliminator, 5spd, 4.0 Fan fails to kick on as engine temp increases, resulting in continuous overheating. motor is good. 100% certain computer temp switch, put in tonight. bad relay maybe? There is one on the driver side fender well that when you jump the wires kicks the fan on, but I've been told that one is for the a/c and defrost and that there is another one somewhere else dedicated to the engine temp and whether or not the fan kicks on. any help would be great, i've also been told that there could be a chance that that particular pin in the ECU could be burned up, the one that controls the fan. What would be the odds of that? thanks for the help