The regulator was bad, there are several threads detailing the adaptation of a W140 regulator to the newer car, but in a nutshell I modified the harness to fit my car and after a simple remove & replace of the blower with the new regulator (saving the old motor) I once again have an AC system that would keep an eskimo happy! Thanks to Phil and the mercedesshop.com members who took time to detail their repairs.
the "normal" way to fix this would replace the regulator, harness, mounting plate and the perfectly good motor - totaling over $1000.00! My repair cost $300 including Fedex overnight! I am pleased to say the least.
The Part# 140 821 84 51 is $270 here - check with Phil to be sure your car uses the same motor). BTW,I found it cheaper elsewhere but I opted to spend the extra $ for my gratitude - karma, you know.


If your ac blower fan is not blowing hard enough to feel it in the back seat, you should replace the regulator. It is an amazing air conditioner on these cars! We have 100 degree days here and the car cools off in thirty seconds - I timed it. Hard to believe but it's true.

P. S. Here's a thread that may helphttp://65.38.163.85./shopforum/showthread.php3?t=85573

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'96 E 3 2 0 (W 2 1 0) M 1 0 4 (Totalled)
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2004 Audi A8L
'98 VW Passat 1.8T 5M
'87 Alfa Romeo Milano 2.5L 5M
'67 Impala convertible, 327cid