Jeep only blows air through defroster vents....
10-26-2009, 05:53 PM
#1
Newbie
Thread Starter
Join Date: Oct 2009
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1997
Model: Grand Cherokee
Engine: 5.2L 318
Jeep only blows air through defroster vents....
1997 Jeep Grand Cherokee TSi
5.8L 318
I apparently have a vacuum problem concerning the air vent gate as air only blows threw the defrost vents. Tried different switch with same results then separated the vacuum connector at the switch and see that there is no vacuum at the lines, I'm in PA. and my repair manual is in GA., 900 miles away. I pulled ALL the lower dash trim off and still am unable to completely see everywhere the vacuum lines go. Anybody know where the vacuum supply comes in at on these Jeeps so I can try and trace problem? Oh, also I found a tiny what appears to be a vacuum cap on the passenger side floorboard. ANY help here would be appreciated..... A vacuum chart for this vehicle would be real helpful if ya know where I can download one. Of course none of the problems I'm having started until I put a 4 Sale sign on her.....
TIA
Detained
5.8L 318
I apparently have a vacuum problem concerning the air vent gate as air only blows threw the defrost vents. Tried different switch with same results then separated the vacuum connector at the switch and see that there is no vacuum at the lines, I'm in PA. and my repair manual is in GA., 900 miles away. I pulled ALL the lower dash trim off and still am unable to completely see everywhere the vacuum lines go. Anybody know where the vacuum supply comes in at on these Jeeps so I can try and trace problem? Oh, also I found a tiny what appears to be a vacuum cap on the passenger side floorboard. ANY help here would be appreciated..... A vacuum chart for this vehicle would be real helpful if ya know where I can download one. Of course none of the problems I'm having started until I put a 4 Sale sign on her.....
TIADetained
10-27-2009, 09:41 AM
#2
Member
Join Date: Jul 2008
Location: Argos indiana
Posts: 210
Likes: 0
Received 0 Likes
on
0 Posts
Year: 98
Model: Cherokee
Engine: 4.0
check under the hood first for vac leaks. thats where I found mine and just had to push the hose back on to work correctly.
hope this kinda helps...
hope this kinda helps...
10-27-2009, 09:30 PM
#3
Senior Member
Join Date: Mar 2009
Location: Telford PA
Posts: 671
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1997
Model: Grand Cherokee
Engine: 4.0L I6
Sadly i cannot help you but I am having the same problem. So if you do find out what went wrong please let me know!
10-27-2009, 11:20 PM
#5
Member
Join Date: Jul 2009
Location: Fort Collins, CO
Posts: 104
Likes: 0
Received 0 Likes
on
0 Posts
Year: 98
Model: Grand Cherokee
Engine: 4.0
I may be mistaken but I believe air only blowing out of the defrost is a default setting when there is an issue with the heating/cooling system...I remember reading about it previously but don't remember the details...
10-28-2009, 07:41 AM
#6
Seasoned Member
Join Date: Sep 2009
Location: East Texas
Posts: 454
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1997
Model: Grand Cherokee
Engine: 4.0
Looking at a picture in my manual it looks like the line enters the cab on the passenger side next to the AC lines. There is a check valve on the line in that general location. The manual shows a few test you can do to check the ac/heater control valve. It operates with vacuum so a leak somewhere is the problem. Defrost is the default setting.
10-28-2009, 08:47 AM
#7
Newbie
Thread Starter
Join Date: Oct 2009
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1997
Model: Grand Cherokee
Engine: 5.2L 318
Looking at a picture in my manual it looks like the line enters the cab on the passenger side next to the AC lines. There is a check valve on the line in that general location. The manual shows a few test you can do to check the ac/heater control valve. It operates with vacuum so a leak somewhere is the problem. Defrost is the default setting.
Rick
Trending Topics
10-29-2009, 02:44 PM
#8
Newbie
Thread Starter
Join Date: Oct 2009
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1997
Model: Grand Cherokee
Engine: 5.2L 318
1997 Jeep Grand Cherokee TSi
5.8L 318
I apparently have a vacuum problem concerning the air vent gate as air only blows threw the defrost vents. Tried different switch with same results then separated the vacuum connector at the switch and see that there is no vacuum at the lines, I'm in PA. and my repair manual is in GA., 900 miles away. I pulled ALL the lower dash trim off and still am unable to completely see everywhere the vacuum lines go. Anybody know where the vacuum supply comes in at on these Jeeps so I can try and trace problem? Oh, also I found a tiny what appears to be a vacuum cap on the passenger side floorboard. ANY help here would be appreciated..... A vacuum chart for this vehicle would be real helpful if ya know where I can download one. Of course none of the problems I'm having started until I put a 4 Sale sign on her..... TIA
Detained
5.8L 318
I apparently have a vacuum problem concerning the air vent gate as air only blows threw the defrost vents. Tried different switch with same results then separated the vacuum connector at the switch and see that there is no vacuum at the lines, I'm in PA. and my repair manual is in GA., 900 miles away. I pulled ALL the lower dash trim off and still am unable to completely see everywhere the vacuum lines go. Anybody know where the vacuum supply comes in at on these Jeeps so I can try and trace problem? Oh, also I found a tiny what appears to be a vacuum cap on the passenger side floorboard. ANY help here would be appreciated..... A vacuum chart for this vehicle would be real helpful if ya know where I can download one. Of course none of the problems I'm having started until I put a 4 Sale sign on her.....
TIADetained
FIXED!!..........Apparently the vacuum line going in through the firewall was already broke and I didn't know it because I thought I did it while looking for the problem.......DUH!!
Thanks go out to those that tried to help!!!
Detained
Thread
Thread Starter
Forum
Replies
Last Post
bradleyheathhays
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
6
10-03-2015 09:51 PM
Rotorhead
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
10
08-31-2015 12:41 PM
Chick-N-Picker
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
21
08-27-2015 12:27 PM
Jethro4days
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
18
08-25-2015 08:42 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)