86 951 Coolant Fan Issue

[johnmc111]

Hi Members -

So my heavily modified 951 is having issues. If you want to know about car you can search for my user name s2cab111 on rennlist. I know I bought someone else's project. But I wanted a DE/track day car that wasn't too expensive. Got it dyno'd and it is 285 at the rears. Survived its first track day the Ridge Motorsports Park. But it has been sitting most of this past year.

I have a great 944 mechanic but he is probably going to close his shop soon and I should really know how to wrench myself. That being said if my questions are novice please understand.

So back to the issues of my radiator cooling fans not turning on. Of course the first culprit is the fan relay. It has gone out before. I know there are three versions of the relay. I took the relay ending in part number 03 from my S2 and put it in the 951. Still no fans after warm up.

So here are my stupid questions. Is there a fuse that I should look at? I have a cheap multi-meter. How do I check if power is getting to the fan units? Or could it be the thermostat?

Thanks again for your help! - John

[djnolan]

One of the best places to learn how to wrench is Clark's Garage: Cooling Fan Operation and Troubleshooting

Good luck!

[944 Ecology]

First thing to do, check that the fans work. After 35 years or so, it is not unlikely that the fans no longer function. Remove the fans and their shroud from the car, then apply 12 vdc to one side of the connector and ground to the other side. The fan should turn fast with a loud rush of air. (Danger: you could lose a finger if you are not careful). If both the fans work, then you are looking at an electrical problem. You may wish to install a switch and a relay to turn them on from the cabin.