Radiator fan problems

Wagoman209

So I am having problems with my radiator fan turning on. I took the coolant temp sensor off and jumped it with a paper clip however that did not turn the fans on. I then tested the fan itself and it works just fine I also changed relays multiple times and that doesn't fix it I know that the car is supposed to be on the on position when jumping it but it does not start the fans. I even pulled the coolant temp sensor plug off because I was going to replace it and jumped the wired directly to each other. Still nothing. Right now I have a toggle switch wired to the relay so I can still turn the fans on/off but I would like to get it back to stock. Is there anything else I can check? I have also checked the fuses under the dash but there all good. Any help is greatly appreciated this is driving me crazy. Thanks in advance. -Jack the wagoman

truckslammer

There is a fan switch that turns the fans on and off. Is that what you checked.....when you wrote "temp sensor"?

Wagoman209

Yes I checked the switch that plugs into the temp sensor on the head. The one with the 2 pin connection by jumping it with a paper clip. The fans did not turn on however my fuses and relay are fine.

civtec350

if it is still an 88-91 block, it should have the fan switch in the back of the motor under the inake manifold. the 2 wire sensor on the head is the coolant temp sensor.

Wagoman209

Oh this is new news to me. I thought that there was only the one sensor I didn't know there was one under the intake for the fans. I am new to D series motors I have had b series in the past an never ran into this problem. Thank you so much for your input civtec350 this is super useful for me!

truckslammer

Yeah, thanks civtech for explaining it better. That is what I was talking about. The switch is above and just to the right of the oil filter. I just replaced one and I used Rockauto.