Question about Jeep Grand Cherokee

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AC on 2004 grand cherokee only coming through defrost vents. need to fix. Maybe something to do with the vacuum hoses?

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Yes vacumn hose no doubt perished

Posted on Aug 22, 2010


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2007 merc grand marquis heater air comes out all of the vents and very little out of the defrost vents

Check to make sure the engine vacuum is getting to the heater/ac control. Bad vacuum hose or leak. Many vehicles use engine vacuum to move heater doors and controls. When the vacuum is absent, it usually defaults to air blowing out the AC vents.

Feb 01, 2014 | 2007 Mercury Grand Marquis GS Sedan

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Stepping down ******* the gas would cause the air coming into the car to shift from the panel vents to the defrost/floor vents and then back again when I would let off on the gas. Currently the Mode...

there is a mixer door in the plenum that could be causing this issue.
or a simple vacuum hose leak could be the culprit as well.

I am thinking the vacuum hose is going to be the problem in this one though.

start the truck and listen under the dash for a vacuum leak... locate it and fix the leak.

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Air is only coming out the defrost vents. when I turn the switch for other vents nothing happen 2004 jeep Grand Charokee

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good luck

Jun 17, 2011 | 2004 Jeep Grand Cherokee

1 Answer

My ac on my 2002 jeep grand cherokee blows thru the defrost only

anitajo60, What you need to do is look in the engine compartment for a vacuum line that enters the vehicle through the firewall. This line is what allows you to change the settings from the defrost to the floor or vent. Usually what happens is the line will break from becoming too brittle from the heat of the engine. A small rubber hose that fits tightly on the vacuum hose will do just fine for a repair. Good luck with this.

May 17, 2011 | 2002 Jeep Grand Cherokee

1 Answer

Hi, why has my a\c air stopped blowing out of the

you have a vacum hose that has come off look up under ur breather and you will find a small hose that has come loose

Apr 11, 2010 | 2004 Jeep Grand Cherokee

1 Answer

Jeep AC blows cold air at defrost and feet but not through vents

There is a flap that directs the air. the flap is controlled by a vacuum actuator. This is located inside the venting. The actuator is connected to little vacuum hoses that attach to the temperature control switch. Either the flap is stuck, or the actuator has gone bad.

Jul 01, 2009 | 1999 Jeep Grand Cherokee

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Climate control doors do not operate properly

the doors work on vacuum: look under your dash where the heater /ac box is located: look for a little hose or, a lever that has fallen off the door assembly

Apr 28, 2009 | 2004 Jeep Grand Cherokee

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Your mode door is controlled by vacuum check the vacuum hose on the left side of the intake manifold. these some times fall off leaving your mode door with no vacuum and the default position of the mod door is defrost.

Jun 09, 2008 | 2004 Jeep Grand Cherokee

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Air conditioning and heating

The vacuum line on the drivers side of the intake manifold just below the throttle body fell off.

May 26, 2008 | 2003 Jeep Grand Cherokee

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