Parts Catalog Accessories Catalog Tech Info Tech Forums
  Search our site:    
 Cart  | Project List | Order Status | Help    

Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 05-05-2003, 01:53 AM
Registered User
Join Date: Mar 2000
Posts: 517
C230 ACC Fan Speed Fluctuation

'97 C230, 70K miles. Climate control fan speed has recently become unstable, demonstrating uncommanded speed changes.

Cycling ACC off/on makes no difference. Otherwise, system cools well (for a Mercedes... ). Any ideas?

Last edited by jgl1; 06-04-2003 at 08:35 PM.
Reply With Quote
Old 05-05-2003, 09:52 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Somewhat common problem is the electronic blower control unit on the blower motor. MB part number 210-820-62-10 & list of $132. Of course the A/C dust filter (microfilter) should be checked & replaced if needed as well.
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
Reply With Quote
Old 05-05-2003, 08:51 PM
Registered User
Join Date: Jun 2001
Location: Omaha, NE
Posts: 962
This probably doesn't apply to your situation, but just in case -- make sure that your center AC vents are not blowing cold air at the cabin temperature sensor by the rear view mirror. Happened to me when a passenger moved the vents fully up; I couldn't understand why my ACC suddenly would exhibit odd shifts in blower speed for no apparent reason...
'93 400E
Reply With Quote
Old 05-09-2003, 02:24 AM
Registered User
Join Date: Mar 2000
Posts: 517
Cabin air filter was CLOGGED. Blower motor function returned to normal following filter replacement.
Reply With Quote
Old 06-04-2003, 08:34 PM
Registered User
Join Date: Mar 2000
Posts: 517
The uncommanded HVAC blower speed change is back... in automatic or manual mode the blower will suddenly, and briefly, increase speed (to max?), although the blower speed indicator on the push button control unit remains unchanged. Along with the speed increase is the sound of perhaps a flap cycling, resulting in increased back pressure on the blower.

The cabin air filter and blower motor resistance unit have been renewed.

Any ideas as to what the problem might be? Push button control unit?

Last edited by jgl1; 06-04-2003 at 08:40 PM.
Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 10:25 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page