Question about 2004 Jeep Grand Cherokee

3 Answers

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.

Posted by on

  • 2 more comments 
  • 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.

    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?



3 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.


    An expert that got 20 achievements.


    An expert that got 10 achievements.

  • Jeep Master
  • 78,254 Answers

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.


  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 3 Answers

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

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

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

Posted on Dec 19, 2008

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

Air will not blow to windshield or floor only front vents. whats the matter?

Always give details about your vehicle. Yr. make, model etc. Some vehicles use vacuum to control the HVAC doors. Some use electric motors. Could be a leaky vacuum switch, actuator, bad motor. Broken door.

Looks like other people have had your problem. Have a look here.

Jan 22, 2016 | Cars & Trucks

1 Answer

When i drive over 50 i get a wistle sound in the dash on my 94 jeep grand cherokee

Try to check the installation of air duct air conditioner. there may be a leak but do not forget to check the bottom of the front cabin near dash.
Good luck

Jan 17, 2012 | 1994 Jeep Grand Cherokee

1 Answer

2003 jeep grand cherokee heater problem

Jeep Grand Cherokee is notorious for broken blend-air doors. This is the door inside the A/C-heater housing that switches the air from hot to cold. You must remove the dash to repair it.

Nov 13, 2011 | 2003 Jeep Grand Cherokee

1 Answer

My 2004 Grand Cherokee only blows air through the defrost vents and none of the other vents. What might be the problem?

One thing it might be is the vacuum operated door motor that is under the dash in the lower middle of the cabin. Or one of the vac lines could be pulled off.

Mar 17, 2011 | 2004 Jeep Grand Cherokee

1 Answer

2004 Grand Cherokee defroster not blowing hot air everything else works

On this year vehicle the flapper should be vacuum controlled. You may want to look at the vacuum lines going to and from the vacuum canister in the engine compartment. If it will change from floor to dash but not defrost then you may have a failed vacuum line or diaphragm in the dash from the selector.

Feb 09, 2011 | 2004 Jeep Grand Cherokee

1 Answer

My heating system work and then blows cold air. one day it works fine and i have all the heat it need. I have to place the selector switch on recirculating air which sometimes blows heat. when the switch...

Sounds like a classic blend door problem. They will start to break and exceed the sensor's travel limit, and then the controller will stop trying to move the door. There is also a known problem when the recirc door breaks, but it is less common. For more info, google "Jeep Blend Doors". For a fix, google "Heater Treater".

Jan 07, 2010 | 2004 Jeep Grand Cherokee

3 Answers

Cold air passenger side, warm air driver's side

same thing happened to mine at 2 yrs. old , the connecting arm on air mix positioner broke. The whole dash had to come out. Part was cheap but labor was huge. This is not a job for the do-it-yourself.

Dec 28, 2009 | 2003 Jeep Grand Cherokee

2 Answers

2001 jeep grand cherokee wont blow air through vents

there is a flap to redirect the air flow under the dash, it may be an item like a pen :) that has dropped down the vent opening stopping it from moving to redirect the air ... failing that, one of the motors/cables that operate the flap has failed

Dec 05, 2009 | 2001 Jeep Grand Cherokee

1 Answer

Air conditioner will only blow out defrost duct

The blend door is stuck in the HVAC housing common problem. The bad part u have to remove the dash to repair the problem blend door.

Jul 18, 2009 | 2004 Jeep Grand Cherokee

1 Answer

Driver side heater blows cold air-passenger side blows hot.

Duct door axle is broken. Dealer will charge $1100 to fix. Go to web site " "
Part will cost around $112. Good luck

Feb 24, 2009 | 2002 Jeep Grand Cherokee

Not finding what you are looking for?
2004 Jeep Grand Cherokee Logo

453 people viewed this question

Ask a Question

Usually answered in minutes!

Top Jeep Experts


Level 3 Expert

78238 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Kevin Daniels

Level 3 Expert

1455 Answers

Are you a Jeep Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides