vent stuck on defrost

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06-04-2007, 06:32 PM

jst854

2nd Gear Member

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Join Date: May 2006

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Posts: 235

vent stuck on defrost

No matter what i have it set to the vents blow on defrost. I just swapped a pi intake in and was wondering if i might have screwed something up while doing this.

06-05-2007, 11:56 AM

m1950

1st Gear Member

Join Date: Dec 2006

Location: Cali Via Texas

Posts: 54

RE: vent stuck on defrost

there is a small vaccuum line on the firewall right where ther heater core lines come out of the wall check to see if it is connected and also did you have any work done behind the stereo.

06-05-2007, 04:13 PM

jst854

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Join Date: May 2006

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RE: vent stuck on defrost

I did put a new radio in but that was about six months ago and it worked fine then, I will check that vacum line by the firewall

06-05-2007, 04:28 PM

BoostedBoxer

Join Date: May 2007

Posts: 3

RE: vent stuck on defrost

It's definately a vacuum problem. Whenever there is no vacuum to the HVAC controls they revert to defrost. Same thing happened to my work truck.

06-05-2007, 04:52 PM

HOLLYWOOD99

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Join Date: Oct 2006

Location: Hellview, Az

Posts: 435

RE: vent stuck on defrost

vaccum prob, not fun... just check em all! its probably a line to the VACCUM ACCUMULATOR in the engine bay..

06-05-2007, 07:47 PM

m1950

1st Gear Member

Join Date: Dec 2006

Location: Cali Via Texas

Posts: 54

RE: vent stuck on defrost

also check behind the stereo there are some lines the go to the control.

06-06-2007, 08:28 AM

contentsunderpressur

5th Gear Member

Join Date: Nov 2006

Location: Bay Minette Alabama

Posts: 3,080

RE: vent stuck on defrost

+1 on the line coming from the firewall. That is the only line that pulls vacume for the AC andit's very easy to break or unplug that brittle POS.

06-06-2007, 08:30 AM

2000GT4.6

6th Gear Member

Join Date: Jan 2004

Location: United States

Posts: 12,575

RE: vent stuck on defrost

Quote:

ORIGINAL: BoostedBoxer

It's definately a vacuum problem. Whenever there is no vacuum to the HVAC controls they revert to defrost. Same thing happened to my work truck.

06-06-2007, 12:08 PM

jst854

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Join Date: May 2006

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Posts: 235

RE: vent stuck on defrost

I am pretty sure that it is the vaccum line from the firewall. There is a hose hanging done there and it was resting on the block and it melted. Where does this hook up and what do you guys suggest that I do.