davek9

3 series BMW's also have similar cooling for the Alt's, and their Alt is above the Pwr steering pump (swap the positions on a 928).

Just saying it is not uncommon on performance cars

Alan

disconnect the sensor (2 pin connector), you can do this most easily by removing the driver side (LHD) headlamp and lowering the headlamp bucket (or by removing the wheel, splash shield and wheel well liner - more work).

Unplug the sensor - test with an ohmmeter, the ohms ranges of interest are:

993 ohms at 0C (32F)
588 ohms at 20C (68F)
457 ohms at 30C (86F)

If this looks about right for ambient you can use a small hairdryer to ensure you see reduction in temperature at higher temps and call it good enough - OR remove the sensor and test the tip of the sensor (only) in standing ice water and warm+(calibrated 30C) water.

Alan

davek9

Alan are the outside temp sensors the same for all years?
I ask because I picked up a used one from 928 Intl and the connector was "keyed" differently from my wire harness on the 86.5.

If they all function the same I can easily modify the "key" on the sensor and make it work.

Thanks,

Dave

Alan

I believe they are all the same - can't be certain for the very earliest cars - however if its not installed - easy to test it... maybe JimB is aware of the different versions...? connector issue only?

Alan

Pyzik

Seen the same alt cooling system on my friends 1987 944 n/a , very good idea from so long ago ...

martinss

Perfect - thanks Alan. I have the sensor out at the moment after repairing the splash shield and while I wait for a replacement duct from Roger.