We took it to the dealer to have them check it out. They couldn't find really anything wrong so they gave me the song and dance about how the coating on the wires deteriorate overtime on the early W-140 models and bascially said the replacing the engine wiring harness would fix the problem. $400 part and $600 labor to install. I told them I would think about it.

I have read on this forum about the wiring issues, but I don't think that this cooling fan problem that we are experiencing is caused by that. Wouldn't other things be effected also if that were the case?

Anyhow, I wanted to ask if stevebfl had a part # for the K9 aux fan relay? Is the K9 relay something I could replace myself?

Thanks again so much!