Hey everyone, I thought I would add something to this thread I recently "resoldered" my one climate control in my one w126..

I resoldered the joints that connect the 3 PCBs...

I also retouched the solder on the thermostat knob, dragged some down the lines that connect the knob to the pins..as well as the stuff on the fan switching side..

I also completely removed the switches PCB, checked for anything broken on it. Apparently the resistors/diode was replaced at one point in time..

I saw a couple traces that looked like they had veins running throu them or something. I decided to grab a screwdriver scrape off the material and lay down some solder in place of it.

I tell you what, I've never seen one of these control things work and change settings and whatnot this fast before. I rolled the temp wheel from cold to hot and as soon as I hit the red relays were clickin and the fan was motorin..

impressive.

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