Quote:
Originally Posted by David D.
What causes the damper doors on the evaporator coil box under the hood to stay open whle in max air mode ?. When open the outside air is pouring in and preventing the ac from cooling.
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Could be vacuum motor bad on damper. Or not getting vacuum to motor. Put control on Max A/C and unplug vacuum line from motor. If getting vacuum then motor is probably bad. If not getting vacuum then you need to trace vacuum source back to the failure point.
Are all your other vacuum operated systems working ok? Like when you switch from defroster to heater or vent does the systems change as they should or not. If not then maybe your vacuum pump isn't working. Can you hear the pump run when you first turn the key on? It should run until vacuum is built up then shut off. If it runs and never shuts off then you have a leak somewhere.