migration_leadfootz3... answered 9 years ago
Defrost is the default mode when there is a malfunction of the vents system. It happened to me years ago in F150. Sorry, but I don't remember if it was a fuse or a vacuum hose. But it was very simple.
air will not change from defrost to vent
2008 Mercury Grand Marquis LS
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Maintenance & Repair
when i put on my defrosts no air goes to windshield only comes out the ac vents
2005 Mercury Grand Marquis LS Premium
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Maintenance & Repair
Just blows hot air usually out the heater ducts or defroster vents. has the dual zone climate control wish I didn't now! but no matter what I set it to. It blows hot
2004 Mercury Grand Marquis GS
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Maintenance & Repair
Blower only gives defrost air regardless of the setting. Additionally, the blower motor died, then a few weeks later kicked on. It functioned normally for the day, and died again the next day. Now ...
2004 Mercury Grand Marquis
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Maintenance & Repair
my a/c works, but i have no heat or defrosters. When I need heat i only get cold air
2007 Mercury Grand Marquis GS
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Maintenance & Repair
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