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 10-24-2001, 12:38 PM
Posts: n/a
Angry Heater/defrost Stoped Working

HELP! I have a 1982 300SD. The other night my defrost and heater were working fine, I stopped for a few hours and when I started it back up nothing works. The fan does not blow, the air conditioner does not kick on when the defrost button is pushed. It's like none of the buttons do anything. I checked the fuses and none look bad. What else could it be ??? I know I need to repair the mono valve, as the seals are bad, would that cause this?? Any help will be greatly appreciated, it's winter and I need the defrost & heat and the fan blowing. THANKS!!!
Reply With Quote
Old 10-24-2001, 01:44 PM
Registered User
Join Date: Dec 2000
Location: Battle Ground, WA
Posts: 576

Hi there,
I had a problem with my heater not coming on also (must be this Washington weather, huh?), and I found that the heater fuse was bad, although it looked good. What apparently happened was that it wasn't real tight in it's holder, and one end melted where it couldn't be seen. When the heater is on high and the switch is in the defrost position, the circuit is pulling very close to the rated maximum of the fuse, and if there's a loose connection there, it will melt the fuse in a few seconds, as I found out after replacing it. Tightening the fuse holder fixed my problem... I suppose there are several other things that could cause this problem, for instance the climate control unit could have gone south, or the switch could be defective. If you have a voltmeter, get it out and check the voltage on both sides of the fuse before deciding it's not the problem!
Good luck with it.

Richard Wooldridge
'82 300D/4.3L V6
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

Similar Threads
Thread Thread Starter Forum Replies Last Post
W123 Turn Signal stopped working dave1shere Diesel Discussion 12 07-30-2013 08:42 PM
560sl odometer and speedometer not working robaincltnc Tech Help 6 04-18-2008 08:47 AM
72 220D Odometer not working Mario Slipac Diesel Discussion 7 08-15-2002 09:21 PM
Blower Not Working Don Hicks Tech Help 3 08-14-2002 12:48 PM
Rear defroster not working larrysiny Tech Help 0 11-16-2001 08:21 AM

All times are GMT -4. The time now is 05:19 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