Coelacanth
Well-Known Member
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- May 10, 2024
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- Edmonton, Alberta, Canada
Going through all my wiring and electrical this summer, when I reinstalled my heater control panel, I discovered my blower motor didn't work on any setting. Low and high were totally dead; medium made a slight click of life but nothing else. I restored my heater box several years ago but the car hadn't started long before that, so I wasn't looking forward to disconnecting all the linkage, hoses, nuts & bolts to remove the heater box and replace the blower motor. Well, if you have a 1968 - 1970 B-Body (this is for a 1970 Charger), here's another thing you can do to troubleshoot a non-working blower motor.
I had some advice from member Daytonavic that the fan control switch could be the culprit. You can carefully pry up the 3 metal tabs holding the circuit board in place, and inspect the metal contacts inside. Yours will probably look as bad (or worse) than mine, with black carboned-up scoring and traces:
After some cleanup with Sprayway cleaner and a little polishing with 1000-grit sandpaper, things looked much better; I also touched up the raised lettering with some fresh white Sharpie oil-based marker. Recall my spare control plate looked like the one on the left:
The switch plate now looks as nice as my good one, that I already installed in my car:
I still have to tweak something inside, but whereas before, I had almost no life whatsoever from the blower motor, now it's working again on low and medium. High fan speed still doesn't work but I know it's the switch, not the blower motor, and this resto process was a lot easier than doing an R & R of the heater box only to have no improvement. I may just need to bend the arm to make a better contact with a low contact point for the light green "high speed" wire.
I had some advice from member Daytonavic that the fan control switch could be the culprit. You can carefully pry up the 3 metal tabs holding the circuit board in place, and inspect the metal contacts inside. Yours will probably look as bad (or worse) than mine, with black carboned-up scoring and traces:
After some cleanup with Sprayway cleaner and a little polishing with 1000-grit sandpaper, things looked much better; I also touched up the raised lettering with some fresh white Sharpie oil-based marker. Recall my spare control plate looked like the one on the left:
The switch plate now looks as nice as my good one, that I already installed in my car:
I still have to tweak something inside, but whereas before, I had almost no life whatsoever from the blower motor, now it's working again on low and medium. High fan speed still doesn't work but I know it's the switch, not the blower motor, and this resto process was a lot easier than doing an R & R of the heater box only to have no improvement. I may just need to bend the arm to make a better contact with a low contact point for the light green "high speed" wire.
