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Old 12-20-2003, 10:23 PM
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Join Date: Dec 2000
Location: Fairfax County, Virginia
Posts: 856
Weird ventilation fan cycling sound in W126

My 1991 350SDL's ventilation fan has developed a cycling sound ... in most cases, while running, it will cycle to higher and lower frequency ... five seconds normal, then two seconds different, then five seconds normal ... continues ... whether in auto or manual switch positions. A/C or heat doesn't seem to manner.

Any ideas?

Thanks, as always!
George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg
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