radiator fan

[ztmac20]

radiator fan runs constant. where is the thermostat that controls this and is it easy to replace.

[Mickey#1]

Does it run when the key is off or do you mean it runs constantly while the engine is running? What year is it?

[ztmac20]

Originally Posted by Mickey#1

Does it run when the key is off or do you mean it runs constantly while the engine is running? What year is it?

1989 and it runs w/ key off. i removed battery cable to see if it would possibly reset some way, but it didnt

[Mickey#1]

The ECM (computer) controls when the fans come on by energizing the coolant fan relays. My 1st guess is that you have a bad relay. I'll see if I can find a wiring diagram.

[Mickey#1]

I couldn't find a good wiring diagram but we can check it out without one. I believe the coolant fan relays are mounted on the firewall. You can unplug the relay & check it out. Do you have a multimeter?