Ive searched the site but i couldnt find a thread on where the exact location of the fan switch is. Im pretty sure mines out because the fan does not come on when the heat goes up, but the fans come on when i turn on the a/c. I want to try to bypass the switch and see if thats the problem. by the way i have a 95 ls.

 

the fan switch is located on the thermostat housing. follow the lower radiator hose to the back of the engine(distributor side as a reference) and when it hits the thermostat housing, you will see it. it is screwed in with a 2 wire connector on it. you may want to remove the intake tubing to access/replace it cuz its kinda under that stuff.