On my 85 300TD Wagon I was having a problem with an intermitten tach and the AC was not very good then the tach stopped completely. And the AC also stopped being cold.

I checked the compressor and it wasn't engaged. I came to the forum & started running the checks it recomened. In the end I jumped across two legs of the Kilma, and the compressor engaged and the air was cold. But the tach didn't work. I checked the OVP relay and the fuse was good. So I changed it with a friends OVP and WOW the tach worked. So I took the jumper off the Kilma and tried the AC & WOW it worked also......

It was a bad OVP relay all the time.
Maybe this short article will help someone else.

Phil

__________________
Phillip Babcock
Ft Myers Beach, Florida

2005 E-320 CDI Desert Silver
2005 E-320 CDI White
1992 300D 2.5 Turbo 2 tank WVO system - selling
1984 300TD Wagon 2 tank WVO system Sold