Re: Another HVAC problem?? (archive)

I had my LEDs go out earlier this year. Blower wasn't working either. I pulled the thumbwheel/pushbutton unit out (arghh!). What I found though is that two of the traces on the circuit board were bad (open circuit). One was worn out by a mounting screw the other was fried. I repaired both and everything is back to normal (i.e. LEDs, blower etc... are working). If you are going to pull the unit it out, its worth a look on the circuit board for any problems. Good luck..

Winter has finally arrived here in NW PA and it time again to address the dreaded HVAC bugs on my '86 735.
Last winter I had a few vacuum leaks that got repaired, blower motor replace, thumbwheel replace, pushbutton replace,
etc. I now notice that my LED's on the PB panel sometimes don't come on again. Sometimes they will flicker. I had the car out tonite and it worked OK, but on 2 occasions the system just quit, LED's out and all. Some playing with the PB's and air volume thumbwheel got it running again.
What am I missing in the system??
The PB controls were new BMW parts and not rebuilt/reworked.
Thumbwheel assy was also BMW.
Any and all comments are appreciated!

Thanks guys,

Tom M. in PA

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