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Air blows out defrost only?

Tiny
DAVIDO
  • MEMBER
  • 2005 JEEP LIBERTY
  • 94,000 MILES
Hello, I have a 2005 jeep liberty and the ac and heat only seems to blow out the defrost position. What could cause this and where is the location of the problem to look at for the fix? I am mechanically inclined so I am willing to do whatever to fix the problem. Thanks for your help
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Wednesday, August 31st, 2011 AT 1:28 PM

13 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hello,

Is sounds like the small vacuum line that goes from the engine to the firewall that feeds the HVAC system is broken here is a guide and a diagrams below to help you see what to do.

https://www.2carpros.com/articles/air-vents-stay-in-the-defrost-position

Check out the diagrams (Below). Please let us know what you find.

Cheers
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Wednesday, August 31st, 2011 AT 1:37 PM
Tiny
DAVIDO
  • MEMBER
  • 4 POSTS
Thank you for responding so fast. I see what your wanting me to look at and I have 1 line going in and then 2 lines coming out on the other side. All the hoses are connected to #4. Other than just eyeing to see if connected was there something else to do at that point? Thanks
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Wednesday, August 31st, 2011 AT 1:47 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Diagram misleading check valve is plastic thing remove if can blow both was the valve faulty
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Wednesday, August 31st, 2011 AT 2:08 PM
Tiny
DAVIDO
  • MEMBER
  • 4 POSTS
I apologize. Not understanding your response. What I did was start the car removed the plastic valve and what I got was suction on the side with the t or 2 hoses and nothing on the other. I am not sure if this does anything for you but please let me know what I need to do from here. Thanks
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Wednesday, August 31st, 2011 AT 2:22 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Turn mode select switch to Recirculate is there vacuum on hose 2?
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Wednesday, August 31st, 2011 AT 2:39 PM
Tiny
DAVIDO
  • MEMBER
  • 4 POSTS
Thank you for responding. I started the car and put it on recirc and disconnected hose #2 from the diagram and the is NO suction. Next so I checked under the hood and sure enough and found a broken line all fixed now thanks. I wish I did that earlier DOH
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Wednesday, August 31st, 2011 AT 3:04 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help

Cheers
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Wednesday, August 31st, 2011 AT 4:12 PM
Tiny
GREG.F
  • MEMBER
  • 3 POSTS
Hello, similar problem here.
In my 2003 liberty/cherokee 2.8crd air flow is stuck blowing from defrost+feet. It would still manage switch to the front vents every now and then until a few days ago, now it seems it's just stuck.
I have been looking for what could be wrong and I found no vacuum at all in the hoses shown in the pictures attached, what is going on?
(What is that component in the last picture?)

Thanks!

Greg
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Tuesday, July 16th, 2019 AT 2:07 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hey behind glove box gain access to vacuum control check valve. See diagram check vac at #2 if none check vac reservoir under hood ie. Follow color of line attached to #2
let us know what u find
Thanks
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Wednesday, July 17th, 2019 AT 8:55 AM
Tiny
GREG.F
  • MEMBER
  • 3 POSTS
Hello Docfixit,
thanks for replying. Meanwhile I found a faulty check valve in a line between the brakes servo and the "tee" where it splits to hvac and to egr valve.
It looks like this could be the cause of the problem (on the other hand I just drove to like 4 replacement parts shops and ultimately to the local Jeep dealer but none of them has it!).
I hope I can find a fairly priced one on the web, including the shipment to Italy, then I'll see if it works.
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Wednesday, July 17th, 2019 AT 9:31 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Docfixit is one of our best! Please let us know what you find. We are interested to see what it is.
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Sunday, July 21st, 2019 AT 2:32 PM
Tiny
GREG.F
  • MEMBER
  • 3 POSTS
Got the replacement online and now it's all fixed! Thanks
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Wednesday, August 7th, 2019 AT 1:15 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Good job! I knew you could do it.
Thank you for using 2CarPros.
Happy Motoring
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Wednesday, August 7th, 2019 AT 1:27 PM

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