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2000 Mercedes Benz C280 AC and HEATER blower won't shut off

Tiny
ROLANDRRF
  • MEMBER
  • 2000 MERCEDES BENZ C280
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 109,000 MILES
I have a 2000 c280, The problem just started last night, When the air blower just won't shut off even when the control is off position, I waited a few minutes if it will shut off, after 5minutes I removed the blower fuse to shut it. I tried to put the fuse back on but the blower just started running again. I even went as far as removing the controller (i think it was called module) and disconnected all the wire harnesses behind it, But the blower still runs. Some say it was the blower regulator. Somebody out there pls help.
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Tuesday, November 2nd, 2010 AT 2:05 PM

7 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi rolandrrf, Welcome to 2carpros and TY for the donation

Check and test the electronic blower control could be shorted out internally-let me know


https://www.2carpros.com/forum/automotive_pictures/12900_blower_relay_Mercedes_1.jpg



The electronic blower control (N29) is located below the glove compartment and is bolted to the blower (A32m1).
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Tuesday, November 2nd, 2010 AT 2:40 PM
Tiny
ROLANDRRF
  • MEMBER
  • 17 POSTS
I checked for continuity and it has a closed contact or continuity.
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Tuesday, November 2nd, 2010 AT 3:07 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Don't have the info is to how to test the controller -Have you tried disconnecting the controller does it continue to run with the fuse in place? If so the controller is shorted out-
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Tuesday, November 2nd, 2010 AT 3:32 PM
Tiny
ROLANDRRF
  • MEMBER
  • 17 POSTS
Do you mean if I disconnect one of the wire on the control and if it stopped running that it could be shorted? And when I disconnected it, the blower stop running, So it should be safe to say that I need to replace the control unit/
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Tuesday, November 2nd, 2010 AT 3:43 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Sounds like the blower control is shorted out if it stops when disconnected-the blower control circuit white and pink wire is shorted to the red and yelow wire on 15/30 circuit
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Tuesday, November 2nd, 2010 AT 5:31 PM
Tiny
ROLANDRRF
  • MEMBER
  • 17 POSTS
OK thank you, I will order the new control. I will keep you posted, Thank you for your help.
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Tuesday, November 2nd, 2010 AT 5:40 PM
Tiny
ROLANDRRF
  • MEMBER
  • 17 POSTS
I replaced the blower controller, and now its working properly, Thank you again for your help. FOR OTHER PEOPLE OUT THERE IF YOUR HAVING THE SAME PROBLEM, DO WHAT I DID, I BOUGHT THE PART FROM EBAY FOR $48, COMPARE TO DEALER PRICE OF $323+TAX.
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Friday, November 5th, 2010 AT 7:22 PM

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