1973 280SEL (116 025) heater controls / water entry - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 04-19-2010, 11:32 AM Thread Starter
BenzWorld Newbie
Date registered: Apr 2010
Vehicle: 1973 Mercedes-Benz 280SEL (German domestic production)
Location: Tsawwassen
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(Thread Starter)
1973 280SEL (116 025) heater controls / water entry

Hey all ...

I posted some general info about my car as an intro here.

I seem to have a jammed defrost duct door mechanism that has me a little baffled. The 10mm nuts on either end of the heater controls pivot were loose - in retrospect, probably done intentionally to protect the mechanism from being forced and broken. It may be that some foreign object(s) have found their way into the defrost duct outlets from above - I didn't lose anything down the outlets but, as mentioned, this could be a long outstanding issue initiated by the previous owner(s).

I have no owner's manual or service manual literature to guide me so have no concete ideas about what the control symbols mean or a procedure for setup / adjustment of the heater controls. See att. JPG photo of my heater controls.

It seems like there is a control rod to each defrost duct door on either side with a heater duct door (?) control rod forming part of the linkage on the R side. With said linkage still intact, when manipulating the heater duct door (?) control rod on the R side, the little bit of movement possible seems to be stopped by the R defrost duct door control rod and whatever is jamming the door.

The defrost duct doors were likely never meant to be independently operable, so, I have wondered to myself if, instead of foreign object entry as the issue, perhaps one or both doors have rotated past its'/their normal operating range and is/are consequently bound up / over-center somehow... or ... is there some control sequencing / procedure to setup / adjust these controls that has so far eluded me?

The issue that precipitated pulling the lower dash panels off is water entry in the R side (passenger) footwell - so far as I can tell, water is dripping down from the center seam of the large round duct encasing the heater blower motor - meaning I likely have years worth of debris plugging up the drain holes in the exterior vent cavities below the windshield and, consequently, rain-water spill-over into my pass. footwell.

Any recommendations as to the best way to unplug the exterior vent drain holes would also be most appreciated.

Thanks, FFF
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