Question about 2004 Chevrolet Silverado 1500 Crew Cab

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Where is the module that controls the heat/ac vents.

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It's the heater controls, thats the heater control module

Posted on Jun 19, 2009

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Posted on Jan 02, 2017

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SOURCE: front panel temperature control switch

Very likely the blend door is broken. This door is mounted beside the heater core, blends cool air with hot depending on the position of the door. At the bottom of the door at the hinge point, there is a gear and coupling driven by an electric motor to position the door. The coupling is a drive much like a square drive ratchet and socket made of plastic and often cracks allowing the drive to turn without changing the door position. I've heard you can drill through the outer housing and put a screw in the door through the drive gear, but you would have to know your way around this area well.
I repaired mine by replacing the blend door, a big job at best. The entire dashboard must come out to access the top of the heater core housing which must be removed.

Posted on Oct 12, 2008

  • 1 Answer

SOURCE: ac only blows through defrost vents

I just found my problem that often brings in a Check Engine light, and reads out a PO 442 code. When my A/C is on my heater would start working because a vacuum operated control door would slam shut when accelerating. Also my cruise control would stop when going up a large incline.

the first thing to check, and easy is the cruise control for a bladder leak. Look on the top side passenger side of the firewall, and you will find a three way vacuum hose connection. One will be a very small black plastic line that runs to the cruise vacuum actuator. Pull this hose loose at the fire wall connection. Blow in this hose, and if it will not hold pressure, and in my case I could hear air passing through it is defective needing replacement. Block off the firewall connection for A temporary fix.

Posted on May 08, 2009

  • 112 Answers

SOURCE: AC does not work. Heater on always even when turned off. Told I needed a climate control module.

If it is a digital control modual they were known to go bad.

Posted on May 17, 2009

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SOURCE: only hot air comes out of vent with ac on

Blend door motor has malfunctioned, or has a vachum leak This needs a lot of tools to test and fix, it could be the control head bad as well. so Let me know if you have the tools and the time ability to do this and we can do a diagnostic fix on it.

Posted on Aug 24, 2009

  • 19 Answers

SOURCE: Recirculation fan motor (ac/heating) and mode

yes there is a fuse.. does it work on any fan speed or none at all?

Posted on Sep 01, 2009

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1 Answer

Having problem switching heat control to floor and defrost


I believe it would be blend door actuator problem

Jan 17, 2016 | 1991 Dodge D150

1 Answer

Air is not blowing from front vent only top vent


You might be in need of a new ac control module. It goes inside the dash board and it switches from heat to cold and which vents to use.

Jun 21, 2014 | Cars & Trucks

1 Answer

No heat from vents


As per your problem mentioned. There are few solved help links to troubleshoot these problems. Go through the list and Click the link below:----

2000 Toyota Avalon: No heat on Passenger Side?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-no-heat-on-passenger.html

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No heat on Oldsmobile Silhouette?


http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html

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Heater blows cold?

http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

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Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

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Hot air on the driver's side vents only?

http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html

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Temperature gauge does not move and no heat when heater is ON?

http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html

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1992 Toyota Camry: A/C Control light Flashing and A/C not Blowing Cold?

http://technoanswers.blogspot.in/2012/04/1992-toyota-camry-ac-control-light.html

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No heat, blower blows only cold?

http://technoanswers.blogspot.in/2012/02/no-heatblower-blows-only-cold.html
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Ford F150 Ac only blows through defrost vents?

http://technoanswers.blogspot.com/2012/01/forf-f150-ac-only-blows-through-defrost.html

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Dodge A/C come out of defrost vents only?

http://technoanswers.blogspot.com/2012/01/dodge-ac-come-out-of-defrost-vents-only.html

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Ac vacuum line on dodge cummins?

http://technoanswers.blogspot.com/2012/01/ac-vacuum-line-on-dodge-cummins.html

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Ford ranger AC blows cold through defrost vents instead on cabin vents?

http://technoanswers.blogspot.com/2012/01/ford-ranger-ac-blows-cold-through.html

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2005 Chrysler PT Cruiser: A/C Blows Warm?

http://whoisbyme.blogspot.in/2012/06/2005-chrysler-p8t-cruiser-ac-blows-warm.html


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2009 Mercury Grand Marquis: A/C blows Cold From Defrost Vent Only?

http://whoisbyme.blogspot.in/2012/06/2009-mercury-grand-marquis-ac-blows.html

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AC not blowing through Vents on 2007 Chevy Trailblazer?

http://schematicsdiagram.blogspot.in/2012/04/ac-not-blowing-through-vents-on-2007.html

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Passenger side temperature is warm air out of dash vents?

http://schematicsdiagram.blogspot.in/2012/04/passenger-side-temperature-is-warm-air.html

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These will help.

Thanks.

Nov 28, 2012 | 2006 Ford Taurus

1 Answer

Had the battery changed, but now the (heat) vents in the top of the van and the floor vent (heat) does not work - only cold air comes out. Also, the heating/cooling dial lets it get hot midway on cold...


Try this calibration procedure and let us know if you have more questions:
  1. Start the vehicle.
  2. Wait 40 seconds for the HVAC control module to self-calibrate.
  3. Verify that no DTCs have set as current DTCs.
  4. Clear all DTCs.
  5. Place the ignition switch to the OFF position.
  6. With the Mode knob in the PANEL position, press and hold the AC button for 5 seconds.
  7. Rotate the Mode knob fully counterclockwise.
  8. Rotate the Mode knob fully clockwise.
  9. Rotate the Mode knob fully counterclockwise.
  10. Release the AC button.
  11. Wait 40 seconds for the HVAC control module to self-calibrate.
  12. Start the vehicle.
  13. Verify that no DTCs have set as current DTCs.

Nov 14, 2010 | 2005 Pontiac Montana SV6

1 Answer

Lincoln mark 8, a/c was working, then kept starting and stopping now dead, compressor works, fan wont blow, even on vent or heat....where is the fuse/relay for this or what else could it be?


It is the blower motor,or the blower relay module,near the blower motor,and check the ac/heat control unit,if the blower ,and relay module turn out to be good.

Jul 15, 2010 | 1997 Lincoln Mark VIII

1 Answer

AC NOT BLOWING THROUGH DASH VENTS


PROBLEM COULD BE BLEND DOOR ACTUATOR OR FAULTY AC CONTROL MODULE.

Jul 06, 2010 | 2002 Ford Explorer

2 Answers

2003 gmc Yukon 5.3 ..2WD air conditioner blows


A vacuum hose that controls the little door that switches where the air blows from is off, its gonna be a real chore the find which one and take the dash out to get to it, but you might get lucky and be able to look underneath the dash from the passenger side and actually see it, good luck

Jun 19, 2010 | Cars & Trucks

1 Answer

I have a '05 Silverado 4wd 4.8L heater problem


my dad had the same problem in his 95 ford ranger it ended up being the control module that selected heating and colling and what vent postion the steper motor should select
you can buypass the module under the hood so it isnt kicking in the ac when you want heat
but ultimatly have the dealer fix it since its a factory defect :) cheers hope this helped

Feb 24, 2010 | 2005 Chevrolet Silverado

1 Answer

Electrical issue


doesnt sound good...i would have the body control module tested

Nov 03, 2008 | 1997 Oldsmobile Aurora

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