Mechanics

GMC JIMMY DOOR PROBLEM

1995 GMC Jimmy • 160 miles

I recently changed the heater core & the car puts. Out heat, but after a few seconds the vent door closes. I can hold the switch and force it to stay open, but I am afraid to damage something. Is there a part that may be replaced to allow the vent door to stay open while heater is on?
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Guest
November 15, 2012.




Are you talking about the actuator for the dash?


JDL
Nov 15, 2012.
Note the vacuum diagram for hvac. The actuator may be losing vacuum?
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JDL
Nov 15, 2012.

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