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  #1  
Old 09-03-2007, 08:36 PM
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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.
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1982 300SD 301k
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Old 09-04-2007, 03:33 AM
toomany MBZ's Avatar
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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.
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84 CD
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Old 09-04-2007, 11:26 AM
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Join Date: Jun 2004
Location: West of Ft. Worth. TX
Posts: 4,079
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.
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84 300SD 350K+ miles ( Blue Belle )
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Old 09-04-2007, 12:09 PM
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mmmmmm Diesel...
 
Join Date: Jun 2006
Location: Royse City Tx
Posts: 4,872
IIRC, Ruben (greasybenz) also has the w126 CD set.
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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
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