A/c only blows out defrost
#1
Junior Member
Thread Starter
Join Date: Jan 2014
Posts: 33
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
A/c only blows out defrost
Can y'all tell me where this vacuum line goes? It is a white-ish green line that comes out of the firewall on the passenger side, it is next to a black one, it was just blocked off. Thanks guys
#3
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,864
Received 1,524 Likes
on
1,236 Posts
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Fill out your profile while you're at it, okay? Or, post your specs in the thread?
#4
CF Veteran
Join Date: Aug 2011
Location: Blue Springs, MO
Posts: 1,031
Likes: 0
Received 2 Likes
on
2 Posts
Year: 1993
Model: Grand Cherokee
Engine: 4.0L Laredo
A vacuum leak causes your vent to default to defrost position. I'd guess the line you're looking at needs to have manifold vacuum. There should be a line on the pass side fender that goes thru your firewall and to a vacuum reservoir somewhere behind the front bumper. If you have cruise control, the line tees off near the servo.
#6
CF Veteran
Trending Topics
#11
CF Veteran
#12
CF Veteran
#13
Junior Member
Thread Starter
Join Date: Jan 2014
Posts: 33
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
Okay well I found that the previous owner took the heater control valve out and just plugged that line up, could that be causing my problem thanks guys.
1990 jeep cherokee laredo
4.0 aw4 269,XXX
1990 jeep cherokee laredo
4.0 aw4 269,XXX
#14
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,864
Received 1,524 Likes
on
1,236 Posts
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
#15
I had the same problem, I followed the vacuum line and it was cracked. As soon as I taped it up it blew cold air from the correct vents. It was cracked right under the battery!
Thread
Thread Starter
Forum
Replies
Last Post
4WD4EVER
Modified XJ Cherokee Tech
28
07-28-2023 07:12 PM
pTacRP
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
14
08-01-2021 12:35 PM
jmsummers2012
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
53
04-30-2021 02:35 PM
jeepdewd
Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here!
20
08-02-2016 01:29 AM
LittleRed94
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
5
10-06-2015 08:09 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)