stogie25

So I was driving home today when my AC turned off. When I looked down I noticed that my cooling system was overheating. I was close to home, so I headed here. The fans that usually kick on when I shut down the car did not kick on. I waited a few hours for the car to cool down and did some testing. The fans turn on when the A/C is turned on. They do not turn on otherwise. I borrowed a relay from a friend and the problem remains the same. The fuses are good. I am thinking the thermoswitch. It is an '88 944 n/a.

Any suggestions are appreciated.

Tom R.

switch mounted at left side top of radiator.

smokin_944

Sounds like the thermoswitch. Swap it out then test the system. Remember you are threading in plastic...

stogie25

Update.

This morning I replaced the thermofan switch, warmed up the car, and the fans never came on. I noticed that the radiator fluid looked horrible. When I jumpered the switch connector everything worked fine.

After a little more research I noticed that the hot coolant never circulated to the radiator, thereby never heating up the thermofan switch, and never turning on the fans. I pulled off the hose to the thermostat, and waited for a friend to help with the snap ring on the thermostat. We got it out, but noticed that the yuck in the radiator fluid was oil, and that the fluid stoppage was an oil clog at the thermostat. A little more troubleshooting showed that the oil cooler seal was bad, so the work began.

I ordered a seal, removed the headers and oil filter. I for some reason can not get the heat shield off of the oil cooler. Clark's Garage says to use a 10mm socket, but that is too small. The 11 is a little too big, and I can't get a vice grip in there. I sprayed some lubricant on the bolts, and am done for the day.

GTSilver944

That sucks. Let me know if you need help with the project. The heat shield uses a 10 mm. Maybe try a 12pt socket if the bolt head's a little stripped.