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2004 GMC Envoy has a banging knocking noise in the dash by defrost every time I start it. blower will not switch from defrost to floor or vents

2004 GMC Envoy knocking or banging noise in the defrost part of the dash every time I start it Blower wil not switch from defrost to floor or to vents stays on defrost only

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  • GMC Master
  • 10,543 Answers

Sounds like the diverter door is bound up causing the motor to bog down under load. You'll need a manual for that job. It's a pain in the rear to get to.

Posted on Jan 30, 2018

Testimonial: "would a bad actuator cause this banging ?"

  • 1 more comment 
  • Lawrence Oravetz Jan 30, 2018

    Yes, but you have to be sure the door freely moves without binding

  • Frank Trombetta
    Frank Trombetta Jan 30, 2018

    how do I get to the door ?

  • Lawrence Oravetz Jan 30, 2018

    The best bet is to get a manual for your vehicle. They have them at most auto parts stores made specifically for your model and year. That saves hauling around a huge manual that contains information you'll never use. You'll see diagrams and a step by step instructions on how to do the job. Look on U tube for some videos, too. That way you'll be able to see what's in store to get at the offending parts.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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justuscc
  • 360 Answers

SOURCE: 1996 mercury grand marquis gs dash blower switch

heres the electrical diag.....58909880

Posted on Oct 09, 2008

  • 239 Answers

SOURCE: 2001 gmc jimmy defroster-heater blower will not direct heat

you have a vacuum leak

Posted on Jan 07, 2009

  • 65 Answers

SOURCE: No air flow from defrost vent on my van.

Could be a vaccum line leaking not changing the vent flap to defrost

Posted on Jan 10, 2009

harley9701ha
  • 424 Answers

SOURCE: Problem with air not coming out of vents.

Check for a vacum leak from the engine to the a/c.The color of the hose is black. Also check if the heater control valve hose is unplugged. If you have vacuum the it sounds like the door for the vent/floor/defrost is broken.

Posted on Jun 08, 2009

  • 179 Answers

SOURCE: blower vent selector switch not working

this is what is called a factory default. for safety purposes if there is a problem with the wiring in the climate control system it defaule to the defrost position so you can see out the window. this can be a pretty tough job, the whole dash may have to come off. unless you well versed in automotive diagnostics and troubleshooting, and have the right equipment, I would take it to a local automotive technician.

Posted on Jul 06, 2009

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1 Answer

Blend door is banging on a 2004 gmc envoy and air flow does not transfer from defrost to vents or defrost to floor


That's the mode door , not blend door . electric actuator motor is bad . replace it .

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On my 2004 Gmc Envoy, Heat only comes out on passenger side, still blows cold air on drivers side. Defrost, floor and vents all produce air flow. Rear heater works fine. A/C works fine. Any idea?


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When you turn the dial to the floor vents, do you hear anything. You should hear a flap or something move after the dials been turned. There's a flap (direction control) just above the blower behind the passenger side dash. This directs the air to where it's supposed to go. It sounds like yours may have come loose

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2003 envoy ac blows cold from defrost and floor but will not dash


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Jun 27, 2009 | 2003 GMC Envoy

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Is it a new vehicle? I had a new vehicle that had the same problem. Answer was that the holes weren't punched out of the vent.

May 23, 2009 | 2004 GMC Envoy

2 Answers

Dash vents not working


It may be the actuator not working properly. Should be above the accelerator pedal to the right.

Keeme

Jun 26, 2008 | 2004 GMC Envoy

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