air only blows defrost

Asked by Jul 02, 2015 at 10:30 AM about the 2008 Mercury Grand Marquis LS

Question type: Maintenance & Repair

air will not change from defrost to vent

1 Answer

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.

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