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1996 Mercury Grand Marquis Question: 1996 Grande Marquis V8 The heater is always on even when you turn on AC



Big Jerry, Potwin, KS, May 01, 2013, 17:21

A few months ago the system started to make a poping noise inside the dash like one of the control functions was in a stuck position. Noise stopped now AC will not work.

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  • Answer #1

    May 01, 2013, 21:35

    Probably a blend door actuator has failed. When they go bad....the vent will not switch from the heat to a/c....Different HVAC lines. Need to have inspection done to see if this is the cause but I suspect it is.

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