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Why does your heater work when not moving and blows cold air when moving in my 1984 Mercedes 380se?
Wiki User
∙ 12y ago
This could either be caused by a faulty auxillary water pump (the electric one that feeds the heater), or by a faulty monovalve that controls when hot water can flow through the heater core.
The monovalve will fail closed if the diaphragm is tore because the increased water pressure (from high engine speeds) will water log the diaphragm and force it closed.
Wiki User
∙ 12y ago
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