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Vents on 2002 silverado are stuck on defroster. Temp control still works just can't get the air to move around the vents.....

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: Air Vents

I had the same problem and read through different forms and when I went under the hood - the vacuum line actually disconnected - put it back on and everything works great - thanks so much for your help

Posted on Jul 26, 2008

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  • 28 Answers

SOURCE: Defroster & floor blowers don't work but front facing vents do

There are what they call mode door's these days they have a electrical motor that turnes the door to different posistions...sounds like yours is become broken. It would depend on your expertise in the ac & heating system area to replace the part. Sometimes easy and most of the times the dash has to be removed.

Posted on Apr 02, 2009

haider_alhar
  • 90 Answers

SOURCE: heater control stuck blowinf hot air out vents

did you cheked if there is enough refrigrant ( freon ) in your tubes by measuring the pressure . if there is you may need to check your condensor its may be clogged and not letting enough air comes through to cool the refrigran

Posted on Jun 01, 2009

  • 323 Answers

SOURCE: heating / air conditioning control stuck to front defrost vents

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.

Posted on Jun 19, 2009

  • 714 Answers

SOURCE: 04 silverado a/c, htr. controls. Only blows through defrost vents

sounds like your door blend actuator which is under the dash and a pain in the **** to replace

Posted on Feb 21, 2010

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1 Answer

2002 Chevy S10 blows warm air on all settings unless it is set for the vents I replaced the thermostat as had code for bad thermostat


You may have a problem with the blend door motors on the side of the heater box. As one other person said: "Look at the controls right above the driver's feet area toward the heater box". If they are moving properly all the way, when you move the selectors on the dash, then there may be a problem inside the heater box. If they don't move all the way, then the blend door motors may be bad or binding. Another common problem on these is the control head on the dash not working properly. The control head can be diagnosed with a scanner that can read codes for it. Hope this helps out.

Oct 28, 2012 | 2002 Chevrolet S-10

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2002 Nissan Sentra Defrost stuck. Only hot air comes out.


The blend door in the plenum is not moving. IT could be the control arm or the control or the door or the shaft. You can access it through the glove box.

Aug 10, 2012 | 2002 Nissan Sentra

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AC will not blow out of the dash vents, only the defroster vents or heater vents. Can I access the vent door underneath the dash?vents


Under neath the venting system behind console there is a venting housing that can be removed. Likely the air flow directional vent flap is stuck or the motor that moves the vent is faulty.

Jun 06, 2012 | 1991 Chevrolet Silverado 2500

1 Answer

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.

Aug 05, 2011 | 2002 Chevrolet TrailBlazer

2 Answers

02 SILVERADO. AIR ONLY BLOWS OUT DEFROST VENTS. REPLACED CONTROL PANEL. NO LUCK


I had a similar issue on an 05 silverado. Air would only blow out of defrost vents. But this worked for me:

1) Unplug HVAC fuse for 10-30 seconds
2) Start truck
3) A/C comes out defrost - wait about 10 to 15 secs
4) A/C then starts coming out the floor vents for about 5 seconds
5) A/C then starts coming out the dash vents.
6) While the A/C is coming out the dash vents, turn A/C OFF (otherwise it cycles back to defrost for good).
7) Turn truck OFF
8) Restart truck and it should work fine

(Found solution on another forum from user "ccurran")

May 15, 2011 | 2001 Chevrolet Silverado 1500

1 Answer

2004 chevy k2500 no air out of defrost vents, temp controls work fine cannot direct air to defrost vent


You may have a problem or bad connection in the a/c-heat control unit I'd remove that and inspect that first. As long as you do have heat elsewhere you can rule out the blend door actuator. There are vents that open and close and you will need to be able to access and check them. You will need to remove dash to be able to get to them.

Jan 22, 2011 | 2004 Chevrolet Silverado 1500 Crew Cab

1 Answer

2005 Silverado 2500HD 4WD - It appears that the pneumatic valve controlling the directional air flow from my heater/AC is getting stuck. When I switch the fan to front window defrost then back to...


The default configuration when all vacuum fails is to defrost vents. Most likely your vacuum supply to the switch is weak. Check the connection of the supply line to the intake manifold for damage. If no problem there, trace it to the switch on the control panel. If there is an accumulator, make sure it isn't leaking and is storing vacuum. If all this is good, look at any other vacuum lines connected to the intake manifold that may be leaking and possibly reducing the vacuum supply to the HVAC control line. Let me know if you have more questions.

Sep 28, 2010 | 2006 Chevrolet Silverado 2500HD 2WD

1 Answer

04 silverado a/c, htr. controls. Only blows through defrost vents


sounds like your door blend actuator which is under the dash and a pain in the **** to replace

Feb 20, 2010 | 2004 Chevrolet Silverado 1500 Crew Cab

1 Answer

On my sons 2000 chevy silverado 4.8 liter....the heater works fine....but when i switch control to defrost....only cold air blows out defrost vents....any help would be appreciated.


the heater & defroster baffles are controlled by electic motors that open and close the baffle (doors) to let the air to the heater and defroster vents. the motor must be bad

Jan 12, 2010 | 2001 Chevrolet Silverado

1 Answer

My Defrost doesn't work


Check to see if the duct hose to the defroster vents has come loose. If air is blowing out under the dash when you have the control set to defrost, then this is likely.

Dec 13, 2009 | 2003 Chevrolet Silverado 1500

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