I have a 2008 grande marque, thats blowing hot air only when I turn on air conditiong> I did not run air conditioning for a while using heater only. The heater will not switch over to cold air will I lower temperature.

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Asked by marguarette Feb 04, 2013 at 05:11 PM about the 2008 Mercury Grand Marquis LS

Question type: Maintenance & Repair

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7jimmy7 answered 3 months ago

deveter flaps sticking,let on for time, may break loose, unless you lost the vacuum to the heater unit from under hood intake hose

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