Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
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Locate and feel both heater core hoses to see with the engine warmed up and running and heater on high heat if both hoses feel warm to hot to the touch and the same in temperature feel.If one feels much cooler then the other this is usually caused by a plugged up heater core needing flushed out or replaced.If you have already replaced the mono valve make sure the valve wiring is o.k.If both hoses are hot and the valve and auxiliary pump were replaced this issue can be caused by a fault with the heater/ac control on the dash itself needing replaced.
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