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Air will not switch to floor on my 2004 envoy

When I switch the air or heat to floor moved on my 2004 envoy the air does not come out it works well on other modes such as defrost and panel

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  • 21 Answers

It is a leak in your vacuum tree that controls the blend door. You can buy spare vacuum line at a parts store pretty cheap. $1 per foot or similar. the trick is finding the bad vacuum line. look for small plastic line coming out of the firewall and replace if cracked

Posted on Mar 18, 2014

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6ya6ya
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Posted on Jan 02, 2017

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motor1258
  • 6674 Answers

SOURCE: blower will not switch to defrost,floor,just vent,no heater

You did check for vacuum lines off, or wiring harnesses not plugged in all the way, or at all didn't you? Did you pay someone to do this, or do it yourself, because if you paid someone, have them look at all the connections .

Posted on Nov 23, 2008

dgjtex
  • 405 Answers

SOURCE: 2000 gmc 2500 pickup heater fan works good but not a lot of air

http://www.fixya.com/cars/t1386554-91_ford Please read this post, I hope it will help you.

Posted on Dec 22, 2008

  • 176 Answers

SOURCE: 2001 olds silhouette - no airflow at defrost vent when in defrost

When you set the Defrost does any air flow from other ports?

Posted on Jan 10, 2009

csmock132
  • 4669 Answers

SOURCE: 2004 GMC Envoy; Very little air flow from FRONT PANEL

Try replacing the cabin air filter.

Posted on Mar 12, 2009

alicantecoli
  • 22219 Answers

SOURCE: a/c and heater only blow air out of defrost

either a vacumn pipe is broken or the ends split so its not passing a vacumn to open the flaps,where they are and how to get to them i cant help because i have never worked on one as they are not here in spain.check the engine end first though .Look for some small rubber pipes running from the inlet manifold

Posted on May 30, 2009

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1 Answer

Wet passenger floor board/2004 Envoy


The moisture drain for the air conditioner is there. When it plugs up, excessive humidity removed by the A/C will leak out onto the floor board.

May 28, 2014 | 2004 GMC Envoy

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Heat blows out of floor and defroster only not vents 93 buick lasabre


Under the dash you have the vacuum motors or servos or
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So a vacuum leak or bad motor, whichever you have or binding
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Hard to work or see things under the dash

If you have any electronics with an auto heat & a/c system then you
will need manuals to diagnose

Nov 22, 2012 | 2004 GMC Envoy

1 Answer

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?


Sounds like the driver's side temperature actuator or blend door are defective. Part of the dash needs to be removed to access these parts.

Oct 26, 2011 | 2004 GMC Envoy

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2004 Envoy Smell like Anti-freeze when turn on the air


probably is a small seep in the heater core. does not have to be leaking enough to find any inside the car to have a strong smell in there just a small seep that makes the heater core wet will do it.

May 20, 2009 | 2004 GMC Envoy

1 Answer

Rear heat blows cold air


one of the second heater core lines is clogged.

Jan 05, 2009 | 2004 GMC Envoy

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