duo-valve

  1. J

    E280 (W124) Auto Est (96) Heating (duo valve)

    I mentioned that I was a little unhappy with my heating, and with tell-tale constant warm air from the dash side vents, and after a bit of research, I have checked the duo valve and adjacent pump. With ignition on, there is vibration from the pump so that seems ok, but NO "clicking" from the...


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