I had an issue in hot weather the fan would either turn markedly slower or would cease working all together. The fan itself works great, so I decided to replace the regulator. With the new regulator installed, even on the high setting, the fan cycles weakly on and off every 5 or 6 seconds. It's way worse. Anyone have any ideas? I can order another regulator since replacing it obviously influenced the fan's operation. But before I do that, is there anything I could have missed? A ground wire or another connection of some kind I may have overlooked?

__________________
1987 300SDL #1, 1987 300SDL #2, 1980 240D, 1982 300SD, 1994 S350, 1990 350SDL, 1991 350SD, 1985 300D, 2005 E320CDI

Gone, but not forgotten: 1981 300SD, 1982 300SD, 1987 300SDL, 1983 300TD, 1980 300CD, 1981 300SD #2, 1987 300D, 1987 300TDT, 1980 300D

I don't know if it's germane to an '05 CDI but the first owner of my '96 E300 (W210) had to replace the controller ("porcupine") in the climate control because the blower ran only at a very low speed. To make it worse, the new controller was not compatible with the old blower and they had to buy a new blower too, even though there was nothing wrong with the old one. Could your car have a similar situation?

Jeremy

__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

There was a VIN break for 211's where you have to replace both the blower motor and regulator as per DTB P-B-83.25/76c.

If your VIN is up to B081230 or X220604, then you must replace both for it to work properly. The earlier blower motors was the actual problem and taking out the regulators. The blower motor was updated as of the VIN listed above so if a problem arises, only the regulator required replacement.

Hope that helps!

__________________
1985 300TD - "Panzer Wagen" - undergoing full restoration (resto - mod)
2014 GLK250 Bluetec - Wife's car

Mercedes-Benz Master Certified Technician.

http://www.flickr.com/photos/joshuajeeper/