Question about 2004 Jeep Grand Cherokee

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Jeep grand cherokee vents

Manual system, recently had recirc door fall off and cut air flow, I did diy fix with zip tie to secure it to the plastic grate behind glovebox. Air flow is back and working fine, but now with system off, I have air coming through the defroster which can be temp controlled by temp dial, again this is with the selection knob to OFF, air flow also gets higher at higher speeds. Also cruise control is working fine

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  • Jeep Master
  • 20,706 Answers

05 GC (WJ)
you hacked the system and wonder why its bad?
huh? what is the question, its not clear.>????
been there done that, but id never ask why, its not working to spec.

many cars have motor actuator driven dampers.
there are 3 types. cable, vacuum and motors and mixed type.
yours is mixed system. motor door and vacuum.
and 2 types single zone and dual. (options)
on the climate control opted car there are 4 motors. (blends)
recirc, mode and driver /passenger blend.
complex that is.
and at least 3 systems used, (options)

best is:
did you ever hear of FSM , the factory service manual an its HVAC chapter, it covers all this.
second best is:
or alldata.com,



http://www.scantool.net/software/alldata-diy-1-month-subscription.html

Posted on Apr 02, 2014

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Posted on Jan 02, 2017

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SOURCE: 1995 Jeep Grand Cherokee- Air vent problem

check your vaccum lines, thats your problem

Posted on Jun 26, 2008

SOURCE: Air Vents

I had the same problem and read through different forms and when I went under the hood - the vacuum line actually disconnected - put it back on and everything works great - thanks so much for your help

Posted on Jul 26, 2008

emissionwiz
  • 76630 Answers

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

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

  • 548 Answers

SOURCE: 2001 Grand Cherokee blower goes to defrost under acceleration

You have a vacuum leak. Look under the dash and check the placement of the vacuum hoses that activate the vent doors. One or more may have slipped or may be cracked.

Posted on Dec 28, 2008

  • 323 Answers

SOURCE: 2001 Jeep Cherokee a/c blows defroster only, no cruise control

There is a vacuum leak under the hood somewhere. Check the vacuum at the speed control servo. If there is no vacuum on the line with the engine running, follow the line to find the leak. The vacuum reservoir is mounted under the battery tray. I would look in that area after confirming no vacuum at the servo.

Posted on Apr 27, 2009

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It will take the average person with little or no auto repair skills approximately 12 to 16 hrs.
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If you are going to do the type of repair where you cut an access hole in the side of the HVAC box.

A short version of how the access hole repair is done:
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