Hey all, I am hoping someone can help me...my 92 bird is having some cooling trouble. It is a 305 TBI. It gets really hot slowly when sitting still at idle, and if I let it, the coolant will bubble into the reservoir.

I replaced the thermostat before I noticed that the cooling fan wasn't spinning, even at its hottest. The fan does come on when I turn on the AC, and cools it almost instantly back to normal. Does it seem safe to assume that it is the switch that is failing? If so, where is it?

Thanks! I love the boards on TGO!

 

With the fan coming on with the AC we know two things.

1. The fan works.
2. The Circuit works.

What we need to find out.

1. On the passenger side just forward of the dip stick is the fan switch. Is the wire connected to it? If not, ground it to chassis with the car in "run" but turned off. Does the fan turn on? If it does, then the relay is good. Plug it in to teh switch and run the car up to temp. Does the fan come on? If not, the switch is bad. replace the switch in the side of the block.

2. If the fan does not come on, it's 99% the relay at this point though it may still be the switch also. You need to pull the fan relay and with the ignition in "run" and the car off, short the two fat wires on the plug. this bypasses the relay. the fan should turn on with the wire grounded to the chassis and if it does, the relay is bad.

that "Should" be all you need to fix it since the circuit and the fan work. hope this helps!

 

Ozz, thanks! The wire had come loose - I can't plug it back into the switch until I can get the car off the ground again, but I grounded the contact and the fan came on. Thanks again!

 

Glad to help!

Many of those wires become disconnected over time for various reasons, usually melted off, fallen off on their own or cut by someone who didn't know what they were cutting.

With the factory manifolds I had to go under the car to get mine out originally. With headers it's a bit easier as I have more room under the car.