Defroster issue

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Jul 30, 2017 | 10:29 AM

supertuff

Thread Starter

Junior User

Joined: Jan 2014

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Defroster issue

79 f150 4x . I turn defroster on and it only comes out passenger side?
initially it had no defroster and I found out that mice had relocated a sofa cushion into the duct work. got that cleaned out and it works fine but only on passenger side, nothing out of the driver side. is it a vacuum issue or what ? any suggestions on a fix.
thanks

Jul 30, 2017 | 10:45 AM

NumberDummy

Ford Parts Specialist

Joined: Nov 2006

Posts: 88,826

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From: Simi Valley, CA

Quote:

Originally Posted by supertuff

79 f150 4x . I turn defroster on and it only comes out passenger side?

initially it had no defroster and I found out that mice had relocated a sofa cushion into the duct work. got that cleaned out and it works fine but only on passenger side, nothing out of the driver side.
thanks

The defroster duct is one piece and is shaped like a Y. The left side of this duct is clogged up, possibly with a pencil/pen or golf tee that rolled into the duct from the top of the dash.

Jul 30, 2017 | 11:28 AM

bryanmartin

Elder User

Joined: May 2012

Posts: 842

Likes: 1

From: Puyallup, WA

Yup, take the dash off and look at it. The problem should be obvious. There is no vacuum involved in the system, it's a simple plastic duct from the blower motor (which feeds both sides) to the vent. No moving parts, so it's either a clog or an alignment issue, meaning the duct has been pushed out from under the vent on one side, so the air is just blowing on the underside of your dash.

Jul 30, 2017 | 05:47 PM

hdgapeach

Elder User

Joined: Jan 2004

Posts: 767

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From: Franklin, GA

Sounds like you might have had more mouse furniture in the system than you initially found (ha!). I'd be pulling the vent hose and checking for obstructions....again.