Question about 2004 Jeep Grand Cherokee

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Heat and air only come out defrost on windsheild not vent or floor

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The air handlers on jeep are powered by engine vaccum and when a loss of vaccum happens the air is defaulted to defrost,so under the hood on passenger side is a 1/8 small black plastic line should be plugged into a bigger rubber or plastic vaccum line sometimes after a few years the rubber boots the use get soft and washing the engine or just moving things around can unhook the small line

Posted on Sep 27, 2009

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Posted on Jan 02, 2017

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Defrorstores stay on ,try to change to floor, ac, heat vent ,deforstores still on 1995 thunderbird lx blower motor works great.


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I have a 2007 dodge 2500 diesel and the heater will only heat up to a very light heat.


Mode Door 1.
a.This door regulates air flow to either the dash vents or defrost/floor. If you have air flowing only through the vents with no defrost or floor, this door is failing. From our experience, this door is usually the first domino to fail. Not sure why, just is.
<!--[if !supportLists]-->4.Mode Door 2.
a.When mode door 1 is set to divert air away from the vents and into the second stage of the system, door #2 chooses whether air goes to the defrost vents to the windshield or out through the floor vents in the passenger and driver's side footwells. Failure is indicated by an inability to choose between defrost and floor.
b.This door turns out to be the most difficult to replace. In order to replace the door, the dash panel has to be removed. It's still better than the dealer fix because you don't have to evacuate the AC system, drain the radiator, and remove the plenum box. But it is more work than the other fixes. When this door breaks, it falls in the down position, blocking the floor vents and diverting all air through the defrost vents. From a safety standpoint, this is good since you'd most likely rather have a clear windshield than warm feet. We suspect that a large percentage of customers will just leave this door unrepaired. You will have heat through the dash vents and to the windshield, just nothing to the floor. It's inconvenient, but you'll have to make the determination if warm feet are worth the extra work to fix the door. An extra pair of socks is easier.

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1 Answer

Heat and ac switches between floor, dash, and windsheild


the door for the air flow is controled by vacuum operated motor. there is a leak in that vacuum circuit. when accelerating, engine vacuum drops until the rpm levels off. when there is no vacuum to the motor, the default postion directs air flow to the defrost vents to make sure you're able to clear the windshield.

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1 Answer

98 chevy tahoe 4x4 defrost quit working. I get heat for the floor and from vents , but not the windsheild defrost . Please help ronandtheresa@gmail.com


Check blend door motors under dash on heater box. Move heater control and see which one is not moving. That's the one thats broken or sticking!

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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.

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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.

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