Better gimme that POS and go buy that E420 SD Floyd Thursby via Mercedes wrote on 5/20/19 10:40 AM:
will sometimes BLOW ICE COLD but more often it goes warm. If I cycle it on/off, or EC on/off, it will sometimes reset and BLOW ICE COLD for awhile. I was thinking it might be a bad actuator on the blend door but apparently there is a valve that somehow controls the hot coolant flowing through that makes heat. I'm not sure if there is actually a blend door like on your basic merkin vehicles or if it has this complicated german valve thing, or both maybe. Anyone have an idea on that? I see where the valve is located and could check on that, but I am guessing the blend door, if there is one, is behind the center console/radio etc. as I can sometimes hear what sounds like a bad vacuum line or solenoid hissing or choking or something up in there.
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