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Heating & Air ConditioningDoes your heater blow cold air? Does your air conditioning blow hot air? Post your all of your technical issues related to your heating, heating core, air conditioning unit and controls here. Don't wait until it is to late to get these important vehicle functions fixed.
My 2000 mercury grand marquis only blows out hot air even when i have it on the a/c. I turned on the heat to for a few minutes and then back to a/c, but now it only blows hot air no matter what i set it to. Not ready to get rid of this car yet, but do not want to spend a lot of money i can put down on a new one. Please help
Most likely the blend door motor. You should also check the blend door for free movement. Check that no foreign objects are in duct. I purchased a blend door motor for my 96 grand marquis at a mercury dealer for $72.00. This is very difficult even for a do it yourself guy. I disconnected the battery and removed the passenger side air bag and air duct. I made a special handle for a 1/4" socket to remove the 4 bolts. I have seen on the net that dealers charge for removing the dash with charges from $800 to $1300 to replace blend door motor.
Location: Detroit, Ex-home of Mayor Kwami Kilpatrick
Posts: 9
i reached up under the passenger side dash and found the vacuum air line controlled cannister that opened/closed the heater vent door.
un-hooked the line and the door shut by itself, POOF, cold air.
just remember to hook it back up in the winter!
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2000 Merc Marquis blowing hot air only !! 
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