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post #1 of Old 09-06-2004, 10:50 PM Thread Starter
Join Date: Aug 2004
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Automatic climate control problem -300SD

300SD I recently bought had some electrical problems, previous owner had the fuse block replaced as it had burnt some terminals. Heat/AC were still non working when I got it. Tonight I pulled the control (pushbutton) assembly out as I was not getting correct voltages to my blower control. The circuit board is burnt in several places. I am so far unable to get to top of circuit board as I can't get the plastic off around the buttons.
Several questions- How do I get the piece off around the pushbuttons? It is loose, but appears to have something holding it on the buttons themselves.
Is it common for this board to burn, if so is there another cause? Blower motor itself checks good, have not checked AC clutch yet.
I am going to solder some jumpers in on bottom of board to repl;ace burnt tracks, but if this does not work, How much is this part from MB?
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