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Old 10-26-2009, 06:53 PM   #1
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Question 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

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Old 10-27-2009, 10:41 AM   #2
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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...
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Old 10-27-2009, 10:30 PM   #3
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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!
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Old 10-27-2009, 10:44 PM   #4
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Quote:
Originally Posted by chrisdm4 View Post
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!
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Old 10-28-2009, 12:20 AM   #5
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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...
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Old 10-28-2009, 08:41 AM   #6
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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.
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Old 10-28-2009, 09:47 AM   #7
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Quote:
Originally Posted by ET JEEP View Post
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.
Is it possible you could scan the Vacuum diagram and the test instructions and send them to me?

Rick
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Old 10-29-2009, 03:44 PM   #8
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Quote:
Originally Posted by Detained View Post
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

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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!!!

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Old 10-29-2009, 03:44 PM
 
 
 
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