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Old 06-11-2005, 01:29 PM
Registered User
Join Date: Sep 2001
Location: Austin
Posts: 28
140 Blower Problem

95 S500

My blower motor doesn't seem to operate at full speed when it is hot outside. The motor has recently been replaced, so my sense is it has to do with a valve/sensor. The refrigerate level is fine. Thoughts?

Lyndon Tilson

Lyndon T

91 300 sl
95 S500
97 SL 500
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Old 06-11-2005, 01:56 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Well, since a new MB 140 blower comes with a regulator one must assume that isn't the problem. I hate assumptions though and would verify the regulator anyway when I verified the control signal. The control signal is a 1-6v signal with 6v being max blower speed.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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Old 06-11-2005, 02:05 PM
sixto's Avatar
smoke gets in your eyes
Join Date: Jun 2000
Location: Eastern TN
Posts: 20,843
You say it doesn't respond to temperature. Does it blow at max when you set the thumbwheel to max?

95 S420
87 300SDL
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Old 06-12-2005, 01:57 PM
Registered User
Join Date: Sep 2001
Location: Austin
Posts: 28
Even when set to max it does not blow hard....until it runs for a while and the interior of the car cools off a bit.

Lyndon T

91 300 sl
95 S500
97 SL 500
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