The classic "stuck on defrost" problem

Atlus · October 6th, 2008, 11:04 PM

Hey guys, haven't been online in a while but just recently had some trouble and figured this was the place to go. A few days ago my vents stopped working and every air setting simply stays on defrost/feet. The AC still works fine, just only in the defrost direction. I did a good amount of research and figured from what I've read it's probably the vacuum hoses, however none of the results online have explained how to go about repairing them (or whatever else it may be).

So far I've tried following the hose from the firewall, however Im really unclear which hose I need to be following and for how far, and what exactly Im looking for since Im still pretty new at this (any pictures would be great). Ive also taken out my dash cd player examined the back of the fan settings for the "yellow wire" though once again not sure what Im supposed to do from there. Basically Im stuck and could use some step by step expertise. Thanks in advance

1994 v6 btw

superpede1 · October 7th, 2008, 09:08 PM

Yup, you have a vacuum leak somewhere, my car does the same thing whenever I get on the gas.

dgt_mustang · October 7th, 2008, 09:47 PM

sounds like that switch panel that controls which vents open and close.

Mustang RacR94 · October 8th, 2008, 12:25 AM

my 94 has the same problem, working on it when i do the motor swap

Atlus · October 8th, 2008, 01:24 AM

Originally Posted by Mustang RacR94

my 94 has the same problem, working on it when i do the motor swap

awesome, good luck with that. If you can, let me know how it goes, Im trying to figure out at this point what I need to do and how haha, unless I just end up taking it to midas

94v6blkndred · October 8th, 2008, 03:24 PM

same problem happened on mine....check on the firewall at the top on the drivers side where there is the junction block of vaccum hoses..i think its the second one down...says AC by it..and follow that hose..mine was broken right in the middle above my intake manifold

Atlus · October 9th, 2008, 12:59 PM

Originally Posted by 94v6blkndred

same problem happened on mine....check on the firewall at the top on the drivers side where there is the junction block of vaccum hoses..i think its the second one down...says AC by it..and follow that hose..mine was broken right in the middle above my intake manifold

Will it say AC on the hose or on the firewall? Ill make sure to check that out thanks

94v6blkndred · October 9th, 2008, 02:39 PM

i believe it says on the tri-connector piece on the drivers side firewall

October 6th, 2008, 11:04 PM	#1
Atlus Newbie 1994 Mustang v6 Join Date: Oct 2007 Location: Santa Cruz Posts: 11 iTrader: 0 reviews	The classic "stuck on defrost" problem Hey guys, haven't been online in a while but just recently had some trouble and figured this was the place to go. A few days ago my vents stopped working and every air setting simply stays on defrost/feet. The AC still works fine, just only in the defrost direction. I did a good amount of research and figured from what I've read it's probably the vacuum hoses, however none of the results online have explained how to go about repairing them (or whatever else it may be). So far I've tried following the hose from the firewall, however Im really unclear which hose I need to be following and for how far, and what exactly Im looking for since Im still pretty new at this (any pictures would be great). Ive also taken out my dash cd player examined the back of the fan settings for the "yellow wire" though once again not sure what Im supposed to do from there. Basically Im stuck and could use some step by step expertise. Thanks in advance 1994 v6 btw

October 7th, 2008, 09:47 PM	#3
dgt_mustang The soul stealing Ginger 2001 Mustang 3.8l Join Date: Jun 2007 Location: Charleston, SC Posts: 3,101 iTrader: 0 reviews	sounds like that switch panel that controls which vents open and close. __________________ Cosmetic: Vent-visors, Pioneer Bluetooth Radio Deck, 17" Cobra Alloy Rims, HID 4500k 55watt setup, Chrome Headlamps 15% Tint, Red sway bar Performance: CAI,Mac-Longtubes, H-pipe, Flow 40s, NO CATS Diablo Tuner, Rear Sway bar

October 8th, 2008, 12:25 AM	#4
Mustang RacR94 MM Fanatic 03 mach 1 13.2@109 Join Date: Dec 2006 Location: Mooretownship,PA kinda close to allentown Posts: 3,041 iTrader: 0 reviews	my 94 has the same problem, working on it when i do the motor swap __________________ 2003 Mach 1, 5 speed U.S. Army - 11B "And on the 8th day god created the infantry and all hell stood at attention"

October 8th, 2008, 03:24 PM	#6
94v6blkndred Hardcore Enthusiast 02 Turboed Saleen Clone faster than my v6 Join Date: Mar 2007 Location: Houston, TX Posts: 1,552 iTrader: 0 reviews	same problem happened on mine....check on the firewall at the top on the drivers side where there is the junction block of vaccum hoses..i think its the second one down...says AC by it..and follow that hose..mine was broken right in the middle above my intake manifold __________________ 94v6.CAI,Exhaust,3:73s-needs rear end rebuild 02GT/Saleen.built motor,62mm turbo 412hp/446tq @10psi,stock TB and intake

October 9th, 2008, 02:39 PM	#8
94v6blkndred Hardcore Enthusiast 02 Turboed Saleen Clone faster than my v6 Join Date: Mar 2007 Location: Houston, TX Posts: 1,552 iTrader: 0 reviews	i believe it says on the tri-connector piece on the drivers side firewall __________________ 94v6.CAI,Exhaust,3:73s-needs rear end rebuild 02GT/Saleen.built motor,62mm turbo 412hp/446tq @10psi,stock TB and intake

October 7th, 2008, 09:08 PM	#2
superpede1 Regular Tricycle Join Date: Aug 2007 Posts: 288 iTrader: 0 reviews	Yup, you have a vacuum leak somewhere, my car does the same thing whenever I get on the gas.

Remove Advertisements Sponsored Links
Forums at Modded Mustangs Advertisement Advertisement

Threads Similar to: The classic "stuck on defrost" problem
Thread	Thread Starter	Forum	Replies	Last Post
Engint "tick" problem	96cobraclone	96-98	0	October 4th, 2008 06:13 PM
Okay, so girlfriend "problem"	f8youthmidman	The Clubhouse	176	July 21st, 2008 09:33 AM
Rob Zombie remaking horror classic "Halloween"	coreysr5	The Clubhouse	13	August 20th, 2007 10:16 PM
What determines a "classic" ?	Mistarella	Classic Mustangs	13	February 14th, 2007 01:53 PM

All times are GMT -4. The time now is 10:33 AM.
Contact Us - Modded Mustangs - Privacy Statement - Top
Modded Mustangs is ©2005-2008, All Rights Reserved, And is Not Affiliated with Ford Motor Company. Forum is powered by vBulletin ©2000 - 2012, Jelsoft Ent. Ltd. & SEO by vBSEO 3.3.2 ©2009, Crawlability, Inc.