Thread: not enuff heat
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Old 12-15-2000, 09:35 PM
Posts: n/a
My '79 300 SD W116 has a "heating water pump" right next to the climate control servo (which I believe is what is referred to as the monovalve by everyone here). This pump is responsible for pumping hot coolant through the heating system. If you unhook the wires from it and hook the pump up to the battery directly, you should hear it. It is possible it is not working properly. My W123 chassis manual shows one, I would start there.
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