Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




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

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 08-11-2003, 12:57 PM
spinedoc's Avatar
Registered User
 
Join Date: Nov 1999
Location: North Grafton, MA USA
Posts: 700
Crazy temp control!! 500SL

Hey guys, on my 1991 500SL Ive got a crazy temp control. For several weeks the buttons light up when pressed, but they dont control their function. So if I press AC the AC does not go on, if I press defrost it doesnt go on, etc etc. Sometimes they do work, but usually they dont.

Just this weekend though it really wigged out on me. The temp control shut off, there was no lights or read out on the display, and my car started to surge. I put it in neutral and the engine continued to surge, even up to 3000RPM's. Also I get hot air out of all the vents. I shut the car off and left it alone for a while and now its back to the intermittent temp control, the surging is gone. Im afraid it will come back or will cause damage to the car.

Any help would be much appreciated.
__________________
2007 Corvette Convertible Torch Red
1996 MBz SL500
2008 Harley Davidson Night Rod Special
Reply With Quote
  #2  
Old 08-11-2003, 09:45 PM
Gilly's Avatar
Registered User
 
Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
Any check engine light or other type of warning lights?

On the 91, I believe that has the overvoltage protection relay. I don't recall having a big problem with the OVP on 129 chassis, but this sounds like a possibility in this case.

Gilly
Reply With Quote
  #3  
Old 08-12-2003, 09:56 AM
spinedoc's Avatar
Registered User
 
Join Date: Nov 1999
Location: North Grafton, MA USA
Posts: 700
No check engine light or anything else. The AC does work as it blows cold air, its just that the control unit will not change the fan speed or the vent location.

One thing is that when I had the surging problem the vents only blew out hot air.

So far Im thinking OVP or the CC unit itself.
__________________
2007 Corvette Convertible Torch Red
1996 MBz SL500
2008 Harley Davidson Night Rod Special
Reply With Quote
Reply

Bookmarks

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 10:03 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, 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