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Then I would start by checking the control head and cables going to the heater box. And the heater control head has vacuum, make sure you have vacuum at the control head. Because the default is to the defrost and floor.
Last edited by master tech; 10-24-2011 at 11:13 PM.
Reason: adding to story
1999 dodge ram van 1500 compressor runs with heat on can anyone help?
Yeah, turn your temperature dial to cold. But if you mean the compressor is running when the selector is set on Heat (Floor), then you have a bad selector switch.