1991 Mercury Grand Marquis Heater A/C only delivers super hot air no setting alters this except OFF


Asked by May 22, 2017 at 01:53 PM about the 1991 Mercury Grand Marquis 4 Dr LS Sedan

Question type: Maintenance & Repair

my 1991 Mercury Grand Marquis has the Automatic temp control ... recently the
heater a/c only delivers super hot air to cabin..no setting on control changes
this except OFF.... repair suggestions?  

2 Answers


More Info: controls do change air flow to defrost/floor/dash etc. Fan speed can be changed. AC settings with coldest temp still delivers super hot air, however to dash vents.

1 of 1 people found this helpful.

Actuator door may not be working properly. It controls whether heat or cooling comes into the vehicle.

1 of 1 people found this helpful.

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