Question about 1999 Jeep Cherokee

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My jeep only blows air out of the defrost vents on top of the dash

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I think you still have vacuum controlled blend doors on that year. If it is a 4.0 liter check the vacuum lines on the intake manifold. Its fairly common for the one that feeds the hvac controls to bloat and fall off.

Posted on Sep 28, 2010

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Posted on Jan 02, 2017

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1 Answer

Heater blows air thru floor vents and dash vents but no air thru defrost windshield vent


Suspect a defective blend door actuator motor that controls airflow for the defrost. This electric motor may be defective and in some makes and models can be extremely difficult/expensive laborwise to replace

Jan 05, 2016 | 2008 Jeep Patriot

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2008 jeep liberty vents not blowing out air?


I also have an 08 liberty, but my issue is that the heat won't blow out on the floor....the air vents and defrosters work great. You can hear it trying to switch over but doesn't. You need a new Air Flap Actuator (16-$30) The real issue is that you have to take offf the whole das in order to fix it. That is abouy 9 hours worth of work.

Oct 08, 2012 | 2008 Jeep Liberty

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Blend door not letting air conditioner switch from dash defroster to dash air vents


ck for vacuum leak some jeeps are vacuum some are electric ,the mode control is in default if vacuum a leak if electric the control panel or mode door actuator , the electric you can sometimes hear if not try to see under dash some the dash has to be removed to see.

Aug 04, 2012 | Jeep Grand Cherokee Cars & Trucks

1 Answer

My 2006 jeep Liberty Front Defrost blows cold air. When I turn on the heat every vent blow hot air, except the front defrost and it blows cool air...any suggestions?


Sounds like defrost door on heater box is not work You need to get under dash and check controls on the box. Good luck

Dec 08, 2010 | 2006 Jeep Liberty

1 Answer

Blowes air throught defrost vents only


its a problem with the switching mechanism. you have to look up under the dash to see if you can see where the switching mechanism is. if you can not see it from there youll have to remove complete center dash

Apr 04, 2010 | 2004 Jeep Grand Cherokee

1 Answer

When I turn my vent selector to defrost on the far right (air con off)the air conditioning comes on. The dash vents will blow ambient air, but defrost setting blows air con. Any ideas?


It's normal for the A/C compressor to come on with the defroster to dehumidify the air so the windsheild won't fog up under humid conditions. You can still control the air temp. out the vents with the temp. select switch.

Jul 19, 2009 | 2005 Jeep Wrangler

1 Answer

Air condition vents on dash are not blowing any air, only the defrost vents on top of dash are blowing, any ideas


It sounds like the flap that controls air flow is stuck. It is controlled by vacuum. The vacuum line could be leaking, the line could be off, or the vacuum actuator could be faulty. Hope this helped.

Jul 17, 2009 | 2001 Jeep Cherokee

1 Answer

No air blowing from the dash vents


sounds like you have a vacuum problem

Apr 14, 2009 | 1998 Chevrolet S-10 Pickup

1 Answer

Heat wont blow through heater or defroster vents


common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.

Jan 18, 2009 | 1997 Chevrolet K1500

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