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#2507819 - 04/23/12 11:11 AM Air only blows out of defroster??
Tweekd Offline
Member

Registered: 08/14/05
Posts: 338
Loc: Orlando , Fl.
Noticed this morning that the my A/C only blows out the defroster vents , not the floor or dash vents .. Is this a vacuume thing , a switch , etc? Something I can fix myself possibly ?
_________________________
1999 Black P71 Interceptor with the toys..



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#2507837 - 04/23/12 11:33 AM Re: Air only blows out of defroster?? [Re: Tweekd]
Leadfoot Offline
Climber

Registered: 01/11/11
Posts: 971
Loc: Montreal, Qc, Canada
blend door is probably stuck
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-Dave

2004 Manual CVPI aka Guinevere - RIP
2003 P74 Crown Victoria LX Spruce Green- Pioneer Avic 930BT head unit with Axxess Metra ASWC-1 for steering wheel controls, Dual Exhaust, Marauder cluster, Autometer 9117 Tach adapter, Marauder gauge pod, 17" CVPI rims, other wise completely stock (for now)

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#2507875 - 04/23/12 12:20 PM Re: Air only blows out of defroster?? [Re: Tweekd]
PKariher Offline
Member

Registered: 11/08/04
Posts: 137
Loc: Durham, North Carolina
Yes, a vacuum thing.

The o-rings wear out and break in the automatic air selector switch on the dash.

http://www.expeditionforum.com/archive/index.php/t-13352.html

http://www.fordf150.net/forums/viewtopic.php?t=72104
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2003 Crown Victoria LX

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#2507885 - 04/23/12 12:27 PM Re: Air only blows out of defroster?? [Re: Tweekd]
Tweekd Offline
Member

Registered: 08/14/05
Posts: 338
Loc: Orlando , Fl.
BUt I have the 3 analog knobs not the EATC..Unless they are the same diaphrams ?
_________________________
1999 Black P71 Interceptor with the toys..



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#2507889 - 04/23/12 12:28 PM Re: Air only blows out of defroster?? [Re: Tweekd]
j5689 Offline
Climber

Registered: 11/16/10
Posts: 627
Loc: Bowie, Maryland, U.S.
His sig says he has a P71 though, unless he got a good one optioned with EATC or he installed EATC himself, I don't think the standard A/C knob system gets the O-ring problem and this would be something else.

If he does have EATC, he should at least be able to manually press the button for the function he needs even if it doesn't automatically go to it when he turns on the A/C because it's defaulting to defroster mode
_________________________
2011 Crown Victoria LX - No mods yet

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#2507917 - 04/23/12 12:59 PM Re: Air only blows out of defroster?? [Re: j5689]
PKariher Offline
Member

Registered: 11/08/04
Posts: 137
Loc: Durham, North Carolina
Originally Posted By: j5689
His sig says he has a P71 though, unless he got a good one optioned with EATC or he installed EATC himself, I don't think the standard A/C knob system gets the O-ring problem and this would be something else.

If he does have EATC, he should at least be able to manually press the button for the function he needs even if it doesn't automatically go to it when he turns on the A/C because it's defaulting to defroster mode


Didn't think about it being a P71.

With the EATC, the o-rings keep the vacuum from leaking and will keep it from controlling where the air is sent. The defrost seems to be the null vacuum setting. I have had to replace my o-rings and another frinds when this started happening.
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2003 Crown Victoria LX

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#2507937 - 04/23/12 01:36 PM Re: Air only blows out of defroster?? [Re: Tweekd]
Tweekd Offline
Member

Registered: 08/14/05
Posts: 338
Loc: Orlando , Fl.
Yup she is a P71 , and I have the standard A/C .
_________________________
1999 Black P71 Interceptor with the toys..



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#2507954 - 04/23/12 02:24 PM Re: Air only blows out of defroster?? [Re: Tweekd]
David1996 Offline
n00b

Registered: 01/16/12
Posts: 32
Loc: Richland, WA State, USA
If there is a linkage under the passenger side dash see if you can gently move it, because it may just be seized from lack of use. Mine was doing the same thing, I wiggled the linkage with the car off and presto it works. Sometimes the linkage gets seized or stuck.

Worst case you have a bad blend door and have to rip apart the dash.

Hope this helps.
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I hope this is helpful.

1996 P71 (red with black fender)

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#2507956 - 04/23/12 02:28 PM Re: Air only blows out of defroster?? [Re: Tweekd]
j5689 Offline
Climber

Registered: 11/16/10
Posts: 627
Loc: Bowie, Maryland, U.S.
I looked at this page and thought it might be something related:

http://www.idmsvcs.com/2vmod/blowerresistor/replace/index.html

It would appear that article is for a different problem but he notes at the bottom:

"Another problem that sometimes afflicts police cruisers is that all air flows out the defroster vents rather than the dashboard vents or floor vents. This is caused by a vacuum leak somewhere. But the focus of this article is on the electrical control aspects of the blower motor rather than the vacuum controlled mode door actuators inside the heater plenum box."

So it may be related to the blend door like Leadfoot said
_________________________
2011 Crown Victoria LX - No mods yet

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#2508026 - 04/23/12 05:11 PM Re: Air only blows out of defroster?? [Re: Tweekd]
Tweekd Offline
Member

Registered: 08/14/05
Posts: 338
Loc: Orlando , Fl.
FFOOOUuunnnnd it! SO with a lil trouble shootig I came to realize that the switch was working fine , because although the air was only blowing out the defroster , it was still turning on the compressor. So I decided tostart in the engine compartment first, and trace back before tearing apart the dash. Behold the black vacuume feed line was rubbing up on the EGR tube and it melted a whole in it.. So for now a little E-tape and a zip tie , whaalaa! Vents working again .. This should hold til I can pick up a cupler and some small tubing to repair it .. Thanks again for all the advice guys , and maybe this is one for a new trouble shoot fix of where to look if it happens again lol.
_________________________
1999 Black P71 Interceptor with the toys..



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