My fan wasn't working on my 85 300SD. After reading around here I finally pulled my new CCU I bought that shortly failed after I purchased it. The plastic was deformed in the same place. Burnt circuit board. So I finally unhooked the Auxillary water pump ( unplugged by battery). I pulled the plastic top and soldered a 22 gauge(insulated) copper wire between the two solder points that spanned the burnt strip. Put it back in and I have A/C. Planning on picking up a junk CCU and refurbish as a permanent solution. I am also going to refurbish the a/c and bring it back to r-12 with a new drier and add the missing switch on the drier that turns on the fan. I just got my 609 cert and waiting for the certificate. I didn't want to use my social. Paranoia.

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My Daily : 96 E-300 Diesel with 195,000 miles
Retired: 92 300D 2.5 T 345K miles and for sale
Retired: 95 E320 157K miles and currently parked with blown engine

Both retired cars are for sale as is my w124 shop inventory