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-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

LinkBack Thread Tools Display Modes
Old 09-03-2007, 09:36 PM
Registered User
Join Date: Oct 2005
Location: Hilliard, OH
Posts: 95
300SD Heat Issue

Hello All. Another 126 climate control issue. First off, does anyone have the FSM section for climate control for my 82 300SD? I will gladly give anyone an ATSG transmission manual in .PDF format. It has been nice here so I have been tinkering some over the long weekend. I had no heat and the airflow would never blow on the floor. After re-soldering the pushbutton unit and the climate control electronic unit, the system is responsive to the temperature dial and will try to blow with some heat. Still no airflow to the floor, though. I tested some vacuum pods and found a bad one behind the pushbutton unit and radio. It seems to be hooked to both doors/flaps for the foot ducts. I ordered a new pod today from Phil. Is this the correct one? I am replacing it anyway since it is bad. I have good vacuum and everything else seems to work. I have no doubt I need a thermostat and probably need to rebuild the monovalve to get the hottest heat but I am focusing still on the floor airflow. It seems like my heat/floor issue had like 5 problems and I am now down to 2 problems so I at least am tickling the problem and I will get there eventually. Thanks for at least reading this, I know my drivel is not the easiest to read. Eric.

1984 300D, 246k, veggie, sold
1982 300SD 301k
Reply With Quote
Old 09-04-2007, 04:33 AM
toomany MBZ's Avatar
Registered User
Join Date: Nov 2006
Location: central Va
Posts: 7,820
Floor heat on both driver and passenger side? On mine, and many others too, I think, just the drivers side would not open. Turns out a failure on the "door" linkage is the culprit. Remove panel just above your legs, you'll gain access to said door, prop open. (I used a spark plug!) Of course it'll be open all the time, haven't noticed any problems.
83 SD

84 CD
Reply With Quote
Old 09-04-2007, 12:26 PM
Registered User
Join Date: Jun 2004
Location: West of Ft. Worth. TX
Posts: 4,098
There are two pods behind the pushbutton controller. The top one is for the center vents and air-conditioning and the lower one is for the footwells. If you found the lower one bad, it seems you have found the problem for airflow. The monovalve is usually the problem if you are not getting heat anywhere.

Sorry, I am currently having communication problems between my pc and scanner so unable to send a .pdf copy.

84 300SD 350K+ miles ( Blue Belle )
Reply With Quote
Old 09-04-2007, 01:09 PM
rrgrassi's Avatar
mmmmmm Diesel...
Join Date: Jun 2006
Location: Royse City Tx
Posts: 4,872
IIRC, Ruben (greasybenz) also has the w126 CD set.

70's SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 210K miles

03 VW Golf TDI 5 speed 372K Miles

RIP--Lost in fire...82 300D 322K was My Daily Driver-On the search for a w126 now...

90 Dodge D250 5.9 Cummins/5 speed. 350K
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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 11:20 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page