Question about 1999 Dodge Durango

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My control knob for heat turns but i only get heat in the defrost stage not out of any other vents

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  • Dodge Master
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Usually caused by a vacuum leak. see solution here to similar problem: http://www.fixya.com/cars/t5949032-air_coming_out_vents_very_little_even

Let me know if you have any questions.

Posted on Oct 15, 2010

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2 Answers

My heat on blows from the defrost how do i fix?


The heat/vent blend door that is located inside of the HVAC system behind dash..Rarely it is the control however it could be....Some of the vent door issues are recalls on certain vehicles."Also Blend vent door actuators that operate the doors can become inoperable...If it is the door inside the HVAC it will probably take about 8 hours to repair...Most vent doors either stick shut and or break..as well as actuators....Only a Dealer Scanner can tell exactly where the problem is.....

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The switch/knob on my dash will not turn to the defrost or floor choices. I can only turn it from dash vents to dash/foot vents. Nothing past that. How do I fix it to where I can access at least the...


most of these are plastic and gum up over time..unless the cams in the back of it are already broken..try a touch of wd40 (lubricant spray) around and under the knob and see if it may be stuck..DO NOT FORCE COLD AS YOU MAY BREAK THE KNOB MOUNT if its really cold outside and you cant get it to work..buy a 12 volt fan that plugs into a cigarette socket and aim it at the windshield as a backup blower..walmart has these for 12-14 bucks and they will help keep the window clear...as long as the vents put out heat..most of the vacuum baffle controls are behind the glove box..under the dash..might need to experiment with the different controls to find the right one and stick it open..good luck..

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Air will only come out defrost vents


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The blower on my a/c on 2002 chevy trailblazer only blows from the floor vents and the defroster vents but not the dashboard vents how can this be fixed. Also, it only works on 5


It sounds like you have two problems. First a question though; Is your heating and air conditioning control on the dash automatic (has two knobs that rotate and a display screen in the middle), or manual (has two levers that move up and down for driver/passenger temp and a separate fan knob and mode knob).

In response to the vents being stuck on defrost and floor, from experience i can say that the most likely cause is the mode actuator has failed. If your battery has recently gone dead, that could have brought the problem to the surface. When the battery has gone dead, the heating and air conditioning controls relearn all the positions of the actuators behind the dash when the vehicle has been re-started. If there is a position sensor failing (which happens quite often) in one of the actuators, the heating and air conditioning controls won't be able to learn the correct position of the actuator and (in your case) defaults to the defrost/floor position.

The only way to fix that would be to replace the actuator. I would like to know what type of heating and air conditioning controls you have (manual or automatic) before i say anything on the blower only working on 5.

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The heater control is stuck in the defrost and lower heat position. The knob turns but the air flow remains the same. I can not get panel airflow, full defrost, full heat,ect. Where do I start? The heat...


you are sure the knob is not stripped right ....it all runs on vacuum look underneath and ensure they are all attached to the cluster on the knob as well check the vent itself and that the cable is not kinked preventing operation ..passengers side upper corner

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you need to check the control wire is`nt broken most likely come out from flap connection just reconnect and it will work again,check the flap affected for free movement as could be jamming.

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There is a vacuum leak under the hood. Find the vacuum line on the passenger side where it comes through the firewall and follow it to the engine. You system needs vacuum to operate and without it the default setting is on defrost for safety reasons.

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i had a simmiler problem on my 95 chevy pick up. on mine it would not chg. from floor to defrost, no matter where i put the selector. with mine it was the controls. if you go under solutions for k1500chevy gmc trucks it should tell you what your problem is, or give you an idea whats going on with yours.

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