Wow, got the same problem, but I get no voltage at the
Regulator/firewall plug. I even swapped the control panel out with a
new one, along with replacing the fan motor and regulator.
I just found that there is a relay??? that controls, among other
things, the climate control fan?
86-9/89 124.030 - up to A 820021
10/89-92 124.030 - from A 820022
5-Pins - ALU Casing
Increase in Shift Point
Burglary Alarm Systems"
I would be interested to know where this is, and if anyone has ever
heard of this relay failing for only one of the 5 things it controls,
rather than blowing for everything.
1989 300E, 243,000 mles