I get hot air out of the defrost and front vents regardless off settings. There's apparently some vacuum issues but when vacuum is applied from an external source the blend doors don't move and they're stuck at full heat. I just got the car recently and there are a few questionable "repairs" to figure out. My mech says he's never seen a heater box go bad but warned that it was sold as a rather pricey entire assembly. We still have a lot of diagnosis to go through but trying to stay ahead of the curve in the event of a worst case scenario.
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[diesel_mercedes] Re: Heater box?
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