Question about 2005 Chevrolet Silverado

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2004 chevrolet silverado ac is not blowing through dash vents only through defrost vents

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  • 123 Answers

These trucks are equipped with an electric vent door motor known as a vent actuator. I believe the actuator that controls this vent is located behind the dash on the driver side.

Posted on May 11, 2014

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6ya6ya
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Posted on Jan 02, 2017

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airjer995
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SOURCE: 2004 Silverado 2500HD a/c is

Sounds like it is going through the recalibration process. We run into this issue when replacing the batteries on these. In the underhood fuse block there is a HVAC fuse. Pull it, wait 30 seconds, put it back in, and turn the key to the run position. You should hear the vents moving around. wait for about a minute or so, do not touch anything. If the self test/calibration passes everything will return to normal. If after several attempts you can not get it to return to normal than there is a problem with the HVAC system that will need to be resolved.

Posted on Sep 26, 2010

  • 29 Answers

SOURCE: 2004 Chevrolet Silverado vent control

sounds like the vacum lines thats hooked up to it is disconnected check that first

Posted on Oct 30, 2008

jsmes1027
  • 749 Answers

SOURCE: 2004 chevy silverado 1500 -

This may be an issue with the actuator wiring harness.There is a known issue of the actuator harness rubbing on an instrument panel brace. This appears to be located behind the glovebox. Would check and make sure this is not the issue you are having. Locate the HVAC actuator harness contact point shown by the arrow in the above illustration. The illustration is of the instrument panel with the instrument panel compartment door opened and folded downward. The actuator harness is located in the left side of the opening in the instrument panel.2f2cfcf.gif

Posted on Sep 25, 2010

  • 12 Answers

SOURCE: air conditioning not blowing thru the vents

There is a black vacuum hose in back of the glove box toward the top connected to a gray hose about 1/8 thick.You need to check to see if there is vacumm there.If yes then you need to take the bolts off to be able to tip the dash back enough to see all the vacuum hoses.Make sure they are all connected.It was alot of bolts but its is the best way.I had a hose off going to one of the acuator doors.Glued it back on and works great

Posted on Jul 17, 2011

  • 3 Answers

SOURCE: Heat wont blow through heater or defroster vents

Had the same problem. believe it or not i changed the gas cap and got heat all around. something about pressure.

Posted on Dec 07, 2011

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2004 silverado ac vent switch


Vac. Leak check under hood & behind dash vac.hose smaller than a pencil

Jul 23, 2012 | 2000 Chevrolet Silverado

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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

2004 Silverado 2500HD a/c is blowing out the defrost and will not switch to dash vents? When I turn the truck off and back on it will blow from floor vents, then dash vents, then blow out defrost vents....


Sounds like it is going through the recalibration process. We run into this issue when replacing the batteries on these. In the underhood fuse block there is a HVAC fuse. Pull it, wait 30 seconds, put it back in, and turn the key to the run position. You should hear the vents moving around. wait for about a minute or so, do not touch anything. If the self test/calibration passes everything will return to normal. If after several attempts you can not get it to return to normal than there is a problem with the HVAC system that will need to be resolved.

Sep 26, 2010 | 2004 Chevrolet Silverado 1500 Crew Cab

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

Defroster/Vent Problem


OK THIS IS EITHER A VACUUM PROBLEM OUR A VAC SOL.PROBLEM SO. FIRST CHECK VAC HOSES YOU WILL SEE THEM ON FIRE WALL CHECK THEM FROM MOTOR TO INSIDE UNDER DASH TO VAC SOL.IF YOU HAVE TO DRAW VAC ON MAIN HOSE AND SEE IF IT COMES OFF DEFROST.

Feb 11, 2010 | Chevrolet 1500 Cars & Trucks

1 Answer

Air only blows outthe defroster vents on top of the dash


unhook battery, rehook battery, turn key on, ..............wait 2 minutes, then start truck and ck a/c. sometimes it works, if not, it will need to be checked by a shop .

Sep 18, 2009 | 2005 Chevrolet Silverado

1 Answer

A/C only blows through defrost vents. Won't switch to floor Or foot vents . Have tried a 2nd control unit in dash


It sounds like the blend door actuator which diverts air from defrost to vent to the floor.
The bad news is it's a bear to get at. It's located behind the glove box.

Sep 05, 2009 | 2004 Chevrolet Silverado

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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