heat constantly blowing from defrost vents - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > heat constantly blowing from defrost vents

Rough Country Deals at JeepHut.comSave at JeepHut on Smittybilt Soft topsUp to $75 Cash Back on Your ARB Fridge Freezer Purchase

Reply
Unread 07-10-2013, 06:27 AM   #1
custom86
Registered User
1994 YJ Wrangler 
 
Join Date: Jun 2013
Location: Streator, IL
Posts: 25
heat constantly blowing from defrost vents

I just bought my first jeep about a month ago and have noticed there is constantly heat coming from my defrost vents. everything is off but still pushing heat out. I have the temp lever set to cool and even if I switch it to vent its still hot. I tried the search function and couldn't find anything. im at a loss to what it is but have not pulled anything apart yet. any help would be great. thanks guys

custom86 is offline   Reply With Quote
Unread 07-10-2013, 07:25 AM   #2
OKwranglerYJ
Registered User
1995 YJ Wrangler 
 
Join Date: Jan 2012
Location: Carnegie, Ok
Posts: 350
http://www.wranglerforum.com/f8/yj-h...ned-68618.html
OKwranglerYJ is offline   Reply With Quote
Unread 07-10-2013, 07:26 AM   #3
rocketboy
Member
 
rocketboy's Avatar
1989 YJ Wrangler 
 
Join Date: Jun 2011
Location: Houston, TX
Posts: 170
I can't be sure this is it but I've had this problem on another car and it was because I had no vacuum to the dashboard controller. The dash controller has two things going on, cables that move duct plenum s around and also vacuum that moves things. I would check both. IIRC when I lost vacuum, the default position was defrost.
rocketboy is offline   Reply With Quote
Unread 07-10-2013, 09:19 AM   #4
custom86
Registered User
1994 YJ Wrangler 
 
Join Date: Jun 2013
Location: Streator, IL
Posts: 25
just checked it out for a min when on lunch and the cables seem to be moving freely although the one that hooks up to the metal tab on the pass side front the little metal tab is secured with some sort of pin looks like and it has a fair amount of slop to it. could that be causing it to not fully close the blend door? didn't have a chance to pull the controller and check vac lines but will do that next. also I happened to pull off the cowl vent off the other day to paint it and noticed there was a rag stuffed down in there on the drivers side. I figured wtf is a rag doing in there and pulled it out. wonder if maybe a prev owner did that to block some of the heat.
custom86 is offline   Reply With Quote
Unread 07-10-2013, 09:18 PM   #5
custom86
Registered User
1994 YJ Wrangler 
 
Join Date: Jun 2013
Location: Streator, IL
Posts: 25
Bump? Anyone?
custom86 is offline   Reply With Quote
Unread 07-11-2013, 09:09 AM   #6
rocketboy
Member
 
rocketboy's Avatar
1989 YJ Wrangler 
 
Join Date: Jun 2011
Location: Houston, TX
Posts: 170
Looking at the link in this post, my theory on the vacuum line doesn't seem to hold up. It looks like you'll need to verify whether the cables are moving all the doors as described in this link.

Quote:
Originally Posted by OKwranglerYJ View Post
If you need a quick fix, being it's July, you could disconnect the heater hoses from the heater core under the hood and splice them. That will stop the hot air from coming out of the defroster. Of course, it will prevent you from getting any heat from the system, which may become an issue this fall.
rocketboy is offline   Reply With Quote
Unread 07-11-2013, 09:48 AM   #7
imstillatwork
Registered User
1993 YJ Wrangler 
 
Join Date: Aug 2009
Location: Oregon Coast, Oregon
Posts: 1,468
I always liked the 90's (maybe even current??) Honda way of controlling heat. The cable actually opened a valve on the incoming heater hose. I never liked the idea of a hot heater core inside the car in the summer.
I looks like it would be rather trivial to convert a YJ to something similar.
imstillatwork is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.