I've got an old Porsche 944 (1983) and recently it started overheating in town, on the highway it's fine.
Not my first rodeo with this car, I checked the fuses first - all OK.
Next, I visually checked the wires under the hood, everything appeared connected and OK.
OK - How about the relay?
Quote:
1. Remove the Air Conditioning Relay.
2. Take resistance readings on the relay as follows:
Terminals "A" to "B" - Reading should be infinite (i.e. open circuit)
Terminals "30" to "87" - Reading should be infinite (i.e. open circuit)
3. Connect a 12 VDC power supply across terminals "85" and "86". You should hear the relay click when you connect the power supply. Make sure you connect the positive lead of the power supply to terminal 85 and the negative to terminal 86. There's a diode in the circuit that will prevent the relay from working if you don't.
4. With the power supply connected to the relay, take resistance readings on the relay as follows:
Terminals "A" to "B" - Reading should be zero (i.e. short circuit) BINGO!
Terminals "30" to "87" - Reading should be zero (i.e. short circuit)
5. If any of the resistance readings taken above are bad, the relay is bad and should be replaced
http://www.clarks-garage.com
2. Take resistance readings on the relay as follows:
Terminals "A" to "B" - Reading should be infinite (i.e. open circuit)
Terminals "30" to "87" - Reading should be infinite (i.e. open circuit)
3. Connect a 12 VDC power supply across terminals "85" and "86". You should hear the relay click when you connect the power supply. Make sure you connect the positive lead of the power supply to terminal 85 and the negative to terminal 86. There's a diode in the circuit that will prevent the relay from working if you don't.
4. With the power supply connected to the relay, take resistance readings on the relay as follows:
Terminals "A" to "B" - Reading should be zero (i.e. short circuit) BINGO!
Terminals "30" to "87" - Reading should be zero (i.e. short circuit)
5. If any of the resistance readings taken above are bad, the relay is bad and should be replaced
http://www.clarks-garage.com
I did not see anything wrong, points were not stuck, did not notice any bad solders, anyone else see anything?
Several years ago a friend from Manteca California, Jim Cooper, sent me a DME relay. He told me it was a DME relay and even after I tried to tell him it was not, he said it was - when he was not feeling well, he was not feeling well.
You know what, I left that relay on my shelf years ago, many years - could it still be there and could it be a cooling fan relay?
Jim's gone, died of cancer, he'll not argue with me about it being a DME relay. I went and looked and there it was and yes it was indeed the relay for the cooling fans!
I know he was smiling.
And I took an especially long drive in his memory.
Here is Jim shortly before his passing with his 944 the local club rebuilt for him.
http://forums.rennlist.com/rennforums/9 ... nwish.html
Great guy, thanks for the relay Jim, and everything else.
Jim almost always drew blood whenever he worked on his 944. And the hour long tasks sometimes became month long - or more.
Whenever someone else did the same, they were awarded the "Cooper Cup", shown above.
