Arthur> are you saying that the fans won't come on if the refregerant isn't at full charge even if the a/c is OFF? That's what it sounds like you are saying, and you may be right, but how does that make any sense? If the coolant temp is too high there should be a separate system that turns on the fans.
Another question - one person says the fans turn on by disconnecting the CT sensor, and you said its the ECT. Which one, if you happen to know, would control the fans on my '90 300CE with the 104 engine?
'84 300D, 174k
'90 300CE, 163k