Question about 2004 Jeep Grand Cherokee

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Air duct doors fail to operate when using the selector knob.

I have a 2004 Jeep Grand Cherokee. When I move the dash air duct selector knob to different locations like window defrost, lower air or combination lower and upper, air flows out the window defrost only...air will not flow out of any other ducts. The doors stay shut and don't operate.

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  • clarkeco Dec 05, 2008

    I found a black 1/4" plastic hose that come out around the passenger firewall side. I'm not sure if it's correct. I don't see any disconnection on this? I was told it's $1,200 fix that involves pulling the dash apart and replacing the aid duct door assembly?

  • clarkeco Dec 05, 2008

    Thanks sooo much. Will do and keep you posted on the results!

  • clarkeco Dec 07, 2008

    I downloaded the entire Jeep Grand Cherokee Shop Manual from a site that gives you a PDF file download for $15.

    http://www.e-junkie.com/shop/product/468...

    The best advice so far was, "Make sure you disable the airbags before working on anything..."

    Not sure if I'll be able to fix this but, I'll have a working knowledge of the problem and no brain damage from accidental airbag inflation, HA!


  • BrendaEllis1 Dec 10, 2008

    Hi, I have a Jeep 2004 Grand Cherokee. The problem is similar to the last person's comments but it started with a noise that sounded like a spray can, when you press it in, letting out air noises. Then a few days latter my vents didn't give out air, only thru the defrost vents. Now the emissions yellow indicator light is on. I am able to get heat but only thru the defrost vents. What's going on with this Jeep?

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There is a very small black hose that provides vacuum to operate the different vacuum motors in the system through the switch you mentioned, that switch simply diverts vacuum to what ever air outlet u select, the vacuum comes from the engine, it goes through the firewall on tha passenger side, like I said it is a small black hose.

Posted on Dec 04, 2008

  • yadayada
    yadayada Dec 05, 2008

    make sure the vacuum reaches the mode control switch, then test the door motors to see if they hold vacuum with a vacuum tester, they are made by a company called MIGHTYVAC, ABOUT $20

  • yadayada
    yadayada Dec 05, 2008

    could you please rate my help, thank you.

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I had a problem with my 03 Grand Limited where the warm stopped working on my dual zone a/c. A few days later the cold would only trickle out on max. Took to dealership and was advised I had two broken doors, one of which controlled the dual air and the other had fallen down and blocked the cool from coming out. Originally the repair to remove the dash and replace was 905. They later called and advised my evaporator coil was showing signs of leakage and I opted to have it repaired also, total cost at 1250, 610 was labor at 7.5 hrs. I found another explanation online that fits my problem. He advised there is a design flaw in the 2000-2004 models where the vehicle calibrates the a/c on every 20th start. This causes wear on the inferior plastic flap doors which eventually break. This appears to be a wide spread problem from what I have read online so far. He further advised that something as simple as a bump in the road could dislodge the flap and cause the blockage, wonder if it would unblock if I had hit another bump! Just got it repaired on 12/30/08.

Posted on Jan 01, 2009

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Check all vaccum lines because the heat selector is completely controaled by vac.

Posted on Dec 19, 2008

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