so I finally decided to tackle the dead blower fan issue in my 94 E420.

What the problem is:
1. Blower motor will not engage in any setting on the CCU.
2. The air compressor does come on and cold air can be felt from the vents if driving at really high speeds with the AC on.

what I did:
1. I took out the blower motor and tested it on the bench and it spun up smoothly and freely.
2. Suspected the blower regulator and bought one on ebay from potomac parts..replaced it and still the same problem.
3. Replaced all fuses in the fuse box and replaced the strip fuse outside the box.
4. Took voltage readings from the 3 pin connector. and I got...
0 volts from the red wire
variable voltage from the yellow wire (depending on which button I pushed on the CCU)
and a solid connectivity ground connection from the last pin.

5. I then suspected the CCU, so I purchased a rebuilt unit and it is still giving the same symptoms.

So NOW...what is my next step. Could the blower motor still be bad even if it worked on the bench

and why am I NOT getting 12 volts from the 3 pin connector?



my next step is gonna be to bypass the regulator by connecting the blue wire to ground...but ANY help is appreciated.

I love my benz.......my wife is complaining again........something about no time for her..or something....BACK TO THE GARAGE!!!

thanks in advance guys