Question about 1993 Chevrolet Lumina

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Air only blows out the floor and defrost duct work when you press vent. It doesn't change. Would that be the dash controls? If so, how do you remove?

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  • 38 Answers

Check for vacum leak under hood sould be small plastic hose good luck

Posted on Jun 24, 2009

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I have a 1975 k5 blazer and it blows cold air it worked fine last year but now it only blows cold air even on the defrost setting what can the problem be and how can I fix it?


A vent flap actuator probably needs to be replaced. It's what moves your vent flaps from heat to A/C or to plain "vent air" when you change settings.

The discussion in the link includes vent flap actuators. Unfortunately, they also include the infamous no low speed fan problem too.

Cannot get any air from dash vents while defrost and floor vents work fine...

Your particular actuator will be a different one than they found.
They're all a absolute pain to get at because they can be well buried in the dash. I would start looking under the dash on the passenger side, that's where most of the air control is. Cannot get any air from dash vents while defrost and floor vents work fine...

Nov 14, 2016 | Cars & Trucks

1 Answer

Ac vents not working


There is a blend door acuator which moves when u change your settings. Its a electric motor. Down under dash, Will need a mech and a heating and cooling diagram to find where the motor is,

Jun 13, 2012 | 2007 Ford Sport Trac Limited

1 Answer

I have a 97 chevy k2500 the fan works, heat and ac works, the floor vents and dash vents work but cant get any air to blow out of the defrost vents. help i have replaced the control panel, still have...


Your vehicle uses electronically controlled blend doors to direct th air flow from defrost to vent and to the floor . If the door motor is bad then it will stay at a fixed position so you will not get the air to flow out the defrost ducts. There are at least two of these one for air blend and one for fresh air. They are located on the passenger side usually under the plastic cover and have a wire harness that plug in and are usually shaped like a piece of pie.

Mar 03, 2011 | 1997 Chevrolet K2500

1 Answer

1992 chevy g20 van ... AC blows through the lower ducts but not the mail cabin vents. What do I look for to fix this?


Behind the dash, when you throw the lever to change which vents you want air to come through, it can sometimes "slip" over little plastic gears/levers which flip the ductwork to different vents such as floor to the dash vents or defrost. look up from under the dash to see if the vent control switch is actually moving anything underthere.

Jul 02, 2010 | 1992 Chevrolet G20

1 Answer

Location and removal of the air vent actuator. step by step on how to get to it and replace it. Air blows and I can control hot and cold but I cant change from floor to vent to dash. It just keeps blowing...


Removal & Installation
  1. Remove the floor air outlet duct extension from the floor duct.
  2. Remove the center console, if equipped.
  3. Remove the screws from the center console duct, if equipped.
  4. Remove the center console duct, if equipped.
  5. Disconnect the electrical connection at the mode actuator.
  6. Remove the mode actuator mounting screws from the HVAC module.
  7. Remove the mode actuator as an assembly with the actuator cam.

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Mode actuator location

To install:
  1. Install the mode actuator as an assembly with the actuator cam.
  2. Line up the heater/defroster valve lever with the mode actuator cam slot.
  3. Line up the A/C valve lever with the mode actuator cam.
  4. Install the mode actuator mounting screw to the HVAC module and tighten to 14 inch lbs. (1.6 Nm).
  5. Connect the electrical connection at the mode actuator.
  6. Install the center console duct, if equipped.
  7. Install the screws to the center console duct, if equipped, and tighten to 14 inch lbs. (1.6 Nm).
  8. Install the center console, if equipped.
  9. Install the floor air outlet duct extension to the floor air duct.
  10. Calibrate the HVAC module actuators.

Apr 18, 2010 | 2004 Chevrolet Tahoe

1 Answer

Air is always blowing throgh the defrost and the floor vents


the ducts are selected by tiny actuators inside the dash and are small flaps that move to cover holes. sounds like they have broken, dash has to be removed to access the air control box and from there see if they are loose

Jul 07, 2009 | 2001 Chevrolet Astro

3 Answers

2004 Ford Expedition XLT, front blend door actuator


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

May 26, 2009 | 2004 Ford Expedition

1 Answer

Auto climate controll only blows through defrost & floor,not the


it either has a vacuum line on the back of the unit off or the control unit is bad

Mar 19, 2009 | 2005 Ford Crown Victoria

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