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Wht does my heater still have hot air coming out even when it is turned off? on 1999 GMC Jimmy

My heater works fine, but when I turned it off today hot air still came out. The blowers were off and all dials turned off.

Asked by for the 1999 GMC Jimmy
the mode door may not be closing when commanded. you need to find the door and see if it closes when turned off.

Roy