Yes and no Mark ;
As the brushes die of wear , the blower will still run on ' high ' but not at the lower speeds .
-Nate
Mark wrote :
Yeah, the '79 SD will be Klima (I)/AutoTemp II.
The fan should blow at top speed when the "DEF" button is pushed, even if everything else is blown/shorted/broken. It's the mode of last resort, insuring at least a clear windshield for safety's sake, bypassing the servo and amplifier, etc.
If it blows on "DEF", then the blower is good, and the problem is most likely in the servo and/or amplifier. If it doesn't blow in "DEF", and the fuse and fuse contacts are OK, then it could be the blower (possible), a wire or connector supplying power to the blower (somewhat possible), or the button assembly itself (not very possible).
I have, somewhere, a .pdf of the schematic of MB's version of the old Chrysler AutoTemp II. Let me know if you would like a copy of it, and I'll dig it up.
Mark
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Posted by: vwnate1@yahoo.com
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