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Originally Posted by sixto
The CD manual shows pin 3, 4, 5, 6, 7 or 11 is powered depending on which blower speed is selected. That pin sends power through a stack of however many resistors is necessary to reduce blower speed. If there is +12V at pin 6 on high and +12V at pin 11 (might be easier to check at pin 5 of the resistor pack) on low then I imagine you can acquit the blower controller. At that point I imagine the resistor between pins 2 and 4 in the resistor pack is open. I'd start at the resistor pack and work back to the blower controller.
Sixto
87 300SDL
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Thanks Sixto.
Any idea where the resistor pack is on the W126? I seem to remember a toaster looking cube on the passenger fenderwell of the W123, but, I haven't noticed the pack on these two?
I suspect that you are right on the money with that diagnosis. The chance of two different controllers being non-functional is just about nil.
Can those coils be replaced, or do you need a completely new unit?