My story of fixing the W126 climate control can be summed up by: If everything points to a problem with an expensive part, don’t waste your time trying to replace the cheaper parts around it in a futile hope it will solve the problem!
After trying a used Climate Control Unit, new fan resistor etc, I finally bit the bullet and bought a rebuilt climate control unit. This solved the problem. In retrospect I probably didn’t need to buy the resistor and I certainly didn’t need the used CCU. It also pays to shop around as a rebuilt CCU was […]