Question about 2006 GMC Envoy

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The upper air vents will not open so only the floor ones and the defrost will work

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{: ) It is possible that the mode actuator is malfunctioning, and this is usually the cause in most cases. It can also be a stuck or binding mode actuator door.
Sometimes the wirings and connectors can give problems. If the signals do not reach the actuator properly, the control sysytem will assume a default mode position, and air will flow only to the floor and defrost vents.
Check carefully your climate control settings.

Posted on Jun 30, 2011

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Posted on Jan 02, 2017

  • 37 Answers

SOURCE: PROBLEM WHEN SELECTING THE DIRECTION FOR THE AIR

Sounds like you have a supply vacuum problem. When you lose supply vacuum to the control head it defaults to defrost.

Posted on Mar 13, 2009

  • 37 Answers

SOURCE: Heat wont blow through heater or defroster vents

The door in the heater box is most likely stuck. It is located under the dash on the passenger side

Posted on Dec 06, 2008

  • 20 Answers

SOURCE: 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.

Posted on Feb 23, 2009

  • 1 Answer

SOURCE: Dash vents will not blow air. Defroster and floor vents blow fine.

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.

Posted on May 23, 2009

cadman000
  • 607 Answers

SOURCE: Air is blowing out of defroster and floor but not main dash vents

Check for vacuum hose leak.

Posted on Jun 17, 2009

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2 Answers

Heater


Pull the AC control in the dash and verify that there is vacuum going to it, all the different air diversion doors are operated by seperate vacuum motors controlled by the ac control head in the dash, as you switch it it sends vacuum to the correct location to work that door for the desired air outlet, dash, floor etc..

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