Question about 2006 GMC Envoy XL Denali

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No air hot or cold is coming out of my front vents or defrost all of the sudden but it will work just fine in the back vents. I haven't had any work on it lately to mess up anything. It just quite w

Just stopped working for no reason.

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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

  • 6 Answers

SOURCE: 2000 gmc sierra 1500 5.3 v8. a/c heater control problem

your heat/cool and vent selection options are controlled by engine vacuum through small clear tubes attached to the rear of your climate control interface. Other vehicles have small steel pull wires that operate the desired changes. You might try removing the trim and any fasteners affiliated with the interface/console. GENTLY pull outward and look to see if any of these tubes are pulled off or cut/damaged. Did anyone recently install a new stereo in the vehicle? If so, the vacuum tubing and or pull wires that change your outlets could have been damaged when the stereo unit was pushed into place. Hope this helps

Posted on Sep 09, 2009

Testimonial: "Very good information. THANKS!"

roniecon
  • 6826 Answers

SOURCE: A/C not blowing thru vents just defroster and floor

It is a vent door actuator motor on top of the blower box,the dash has to be removed and set in the seats to replace the actuator motor.Cost for the part is about 50.00 dollars

Posted on May 23, 2010

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some external sensor has taken a knock etc
sounds like its not getting whats going on outside
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These selections are run by Engine vacuum. sounds lie a diaphragm is NG to control the lower door

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2003 ford expedition i just got it a week ago and the front heat works great but the back vents only blow cold air. How do i fix this?


With the car parked and engine idling, turn the ventilation control between windshield defroster and "open air ducts" to front and rear vents. Listen to pinpoint where the valves are that open and closes the air ducts. It sounds like the air duct to rear vents are blocked, and the cold air in rear air duct is coming from "outside ventilation." The air vent to allow hot air to the rear vent is stuck in "open ventilation" mode, like when you're driving in spring or summer months.

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2001 volvo s40- When defrost is chosen on control, the AC light comes on and the air exits the front vents. Very little air exits the defrost ducts on wnshield


I am not an expert of Volvo's but what you describe is normal operation for most cars. If hot air was directed at a very cold windshield it could crack it. So when you kick it over to defrost, the hot air is mixed with AC air and the amount of air flow is restricted so that it doesn't crack.

Did the operation of your Volvo defrost system seem to change all of a sudden and that is the reason you posted this? If so how did it change?

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plurbaby236, The venting system for the front of your vehicle is controlled by a vaccum line coming from the engine the rear is electric. You may have a broken vacuum line in the engine compartment. When this happens the defrosters are a default setting. Check for a small vacuum line going through the firewall, usually near the middle and follow it. You may find that it is broken. A quick repair is to take a small piece of rubber hose that fits snuggly on the plastic vacuum hose. Good luck with this.

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Hope I was avle to help, glad you up and going.

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the blendor actuators strip out the gear inside the actuator cases on these all the time. replace the actuator.

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1 Answer

A/c problem


You either have a bad control, or motor running the air direction door in the front HVAC unit, or a door that is stuck.

The front and rear units are totally separate.

The door directs where the air, cold or hot, should come out, whether it is panel vents, floor, defrost, or any combination of those.

This door and motor are located inside the heater box which usually requires a lot of the vehicle dash assembly to be taken apart to get to these parts.

Aug 28, 2008 | 2000 Ford Expedition

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