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86 420 no heat when moving
1986 420sel the heater will work while i am sitting still but when i start moving or rev the engine up the air turns cold.
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This sounds more like a flap problem to me, meaning that the flaps are moving into the "cool" position for some reason. Maybe a vacuum problem. Hot water in the heater core won't turn instantly cold.
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check the climate control system out
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Sounds like a broken monovalve diaphram.
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