jcyuhn,

What you described is my current failure mode ... when tach goes to zero the compressor declutches. When (this is happening less and less often) the tach starts up again, the clutch activates, as well.

Sounds like I should:

1. Check wiring from Klima back to sensor pickup
2. Check Klima connection - would a failing relay give the same indications over a several month period of time and if the relay itself is fried, how do I tell?

Thanks!

__________________
George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg