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Old 08-01-2004, 10:49 PM
Registered User
Join Date: May 1999
Location: Somers, CT
Posts: 73
w140 Blower Fan runs on High

I just replaced the blower motor on my
93 300sd.

Now the fan will suddenly run on the
high speed, regardless of temperature.
The high speed seems to be the speed
and which it would run to work the
defroster. However it is blowing cold air!

It will run on high for a few minutes then
suggendly drop to normal. This has been
happening with increasing frequency
since I installed the new blower motor.
Now it wants to run high almost all the

When I press 0, it cuts off.

BTW, the outside sensor, per the diag
test reads at 0F or 5F or 99F.


Ralph Burnette
1993 300SD (286k + miles)
2000 SL500
2001 ML320
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