I have a 2008 Jeep Liberty Sport. The air for the a/c and heat will only come out of the defrost and floor vents. I have no problem with the air changing from hot to cold.

SOURCE: No dashboard heat output

The climate control was poorly designed on these cars.

There is only heat on the floor and defrost settings, due to the layout of the ductwork.

Posted on Nov 22, 2008

SOURCE: 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.

Posted on Feb 23, 2009

SOURCE: 1999 Jeep Cherokee sport/air vents do not blow out cold or hot while it is on

this sounds like the recirculation door in the heater box is broken and this is a difficult and can be an expensive repair as the dash has to be removed for access. a quick check for this is if you release the glove box and let it hang you will see the heater box if you reach up to the left top you will feel a grid and the recirc flap is housed there you can operate the blower and hot and cold and see if flap moves

Posted on Jun 22, 2009

Dana Newcombe

• 1564 Answers

SOURCE: 1997 ford e250 van. heat only no cool air.

One of your deflector door servos or the door itself, is hanging up. To determine this more clearly, run your vehicle for about two minutes and shut down the engine. Move your function selector knob from defrost to floor to panel and listen carefully for a sweeeping sound. if you do not hear this sound you've got to check under the dash for a loose vacuum line or under the hood for a loose or broken line to the vacuum accumulator. The vacuum accumulator is a large black ball on the firewall with only two lines connected to it. One line is about3/32nds of an inch and the other will be about one quarter inch. Check these lines well, for they control ALL the functions within yout climate control. Best of luck my friend, Dana

Posted on Jan 20, 2010

SOURCE: My 2006 jeep Liberty Front

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

Posted on Dec 08, 2010