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Defroster not working


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OhLiz
New User

Aug 6, 2012, 6:06 PM

Post #1 of 2 (2474 views)
Defroster not working Sign In

Hi,
My front defroster won't work, it blows out every vent except the defroster. I don't know what the trouble is, but I would like to know before I go to have it checked. The blower didn't work at all a couple times, but it's been working good for a few months now, I did notice a new noise when I turn it on now. Would that be the reason the defroster doesn't work? I should replace it?
I appreciate any help and advice, Thank you!Smile
2003 Mercury Sable 3.0L V6 DOHC


(This post was edited by OhLiz on Aug 6, 2012, 6:07 PM)


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Aug 8, 2012, 5:35 PM

Post #2 of 2 (2417 views)
Re: Defroster not working Sign In

Both manual and automatic ac systems use vacuum to control air distribution through the chamber box. Usually if you don't have vacuum, mode door defaults to the defroster position.

Probably going to have to remove the passenger side air bag and inspect the defroster vacuum motor and see if it moves when you change your vent selections. If it does move the linkage back and forth, you might have a mechanical problem with the defroster door inside the chamber box.





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