Jeep only blows air through defroster vents....
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Newbie
Joined: Oct 2009
Posts: 5
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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
I like it in the dirt
Joined: Jul 2009
Posts: 1,802
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From: Alberta Canada
Year: 2003
Model: Grand Cherokee
Engine: 4.0
Member
Joined: Jul 2009
Posts: 104
Likes: 0
From: Fort Collins, CO
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...
Seasoned Member
Joined: Sep 2009
Posts: 454
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From: East Texas
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.
Thread Starter
Newbie
Joined: Oct 2009
Posts: 5
Likes: 0
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
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Thread Starter
Newbie
Joined: Oct 2009
Posts: 5
Likes: 0
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
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