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I have a buzzing/grinding noise in the HVAC system when changing the air flow from floor to vent to defrost. Also makes a noise when first starting vehicle and when shutting off.

2006 Lexus GX470

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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kn1ckfan
  • 8 Answers

SOURCE: HVAC vent selector does not function. Air flow is

THe blend door seems to be stuck. When you change settings from defrost to floor air or, vent, the blend door opens and closes directing the air to the place you want it to go to. I have had some success spraying a lubricating oil such as WD40 under the dash on the blend door. You need to get under the dash with a flashlight to locate it. It looks like a flap. Spray it with a couple of shots of the WD40. Go easy on the spraying as you may be inhaling the fumes. Keep the doors and windows open to minimize the fumes. Wait about 1/2 hour and try the A/C functions. (defrost, floor, vent air)

Posted on Mar 09, 2009

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  • 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

chuck943
  • 783 Answers

SOURCE: 2006 Ford Crown Victoria HVAC only blows thru windshield defrost

You have a vacuum leak. Defrost is the default postion(no Vacuum). Start by finding the small black vacuum line near the heater hoses at the fire wall under the hood.Trace it back, it should go to a square black reservoir . Not totally sure exactly where it is located on this model,shop manual doesn't show a very good pic, but it states to remove wiper arm and pivot shaft to remove it. You will see a second line going from here to intake manifold vacuum port. Make sure you don't have a leak there somewhere.

Posted on Mar 14, 2009

  • 169 Answers

SOURCE: my 2002 trailblazer is making a clicking noise in the a/c

more likely a broken door in hvac case.with car running work controls and watch actuaters operate to locate good luck maybee a little challange

Posted on Aug 30, 2009

  • 63 Answers

SOURCE: 2003 Trailblazer No air from front face vents

first check to see if you have power going to the actuators when you switch the switch to it location if no power replace controller if you have power and no movement from actuators replace actuator. if actuators move remove hvac box and check for broken blend doors.

Posted on Jan 22, 2010

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1 Answer

2007 Trailblazer 4.2L no air front vents a little air from consel vent any ideals? This is a climate control system.


I assuming the blower motor is working ? Because you don't say one way or the other . When switching from floor to vent to defrost do you hear any noise from in back of the I/P ? Mode door actuator . When moving from heat to A/C does anything change ? Or stay the same ,little air flow ?

I know must people do not want to hear this but you should take it to the dealer an have it checked for DTC'S - diagnostic trouble codes ! The auto parts stores con not read these codes .
More then likely one of the system actuators ( electric motor ) is bad an code is present .
DTC B0229, B0414, B0424, B3761, or B3770
The following DTCs are for the HVAC door actuators:
• B0229 is for the recirculation actuator.
• B0414 is for the left air temperature actuator.
• B0424 is for the right air temperature actuator.
• B3761 is for the defrost actuator.
• B3770 is for the mode actuator.

DTC B0248, B0263, B0268, B0408, or B0418

The following DTCs are for the HVAC door actuators:
• B0248 is for the defrost actuator.
• B0263 is for the mode actuator.
• B0268 is for the recirculation actuator.
• B0408 is for the left air temperature actuator.
• B0418 is for the right air temperature actuator.

Mar 13, 2017 | Cars & Trucks

1 Answer

How to repair auto a/c problem. A/C not blowing from dash vents, only. Issue occurred immediately after replacing a bad battery.


When you change air flow direction from defrost ,to floor ,to vent . does air flow change ? Where is the air coming out of ? Does it stay there ?

Oct 02, 2016 | 2004 Chevrolet Chevrolet TrailBlazer LS

1 Answer

2005 Ford Focus. Air is blowing out of the floor vents and defrost vents but not dash vents. Also the knob will not go onto the dash vent option it's like it just springs back up.


A failure has occurred in the HVAC system, legally, when a fault happens the hvac system will default to defrost/floor. Further diagnostics will be needed to determine issue.

Jun 05, 2015 | 2005 Ford Focus

1 Answer

Why is hvac air coming from all three locations (vent/floor/defrost) regardless of switch setting?


Check air box if it won't change air flow some thing is wrong there inside the car

Jul 14, 2014 | 2000 Buick Regal LS

2 Answers

Changed battery and now the A/C won't blow out dash vents.


You need to have the HVAC reset itself. Turn off all HVAC function and set all switches to CCW position, disconnect battery for about 10 minutes. Reconnect battery and do not touch any HVAC controls for several minutes, the system will go through a calibration sequence.

Jul 19, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

AIR FLOW CONTROL HEAT an aircon. Will not go to floor or defrost.


i had that problem but in reverse i had no vents, its a hvac mode acuator, it controls where the air goes sounds like yours is dead

Mar 18, 2010 | 2001 GMC Jimmy

1 Answer

2003 Trailblazer No air from front face vents


first check to see if you have power going to the actuators when you switch the switch to it location if no power replace controller if you have power and no movement from actuators replace actuator. if actuators move remove hvac box and check for broken blend doors.

Jan 22, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

My 2002 trailblazer is making a clicking noise in the a/c


more likely a broken door in hvac case.with car running work controls and watch actuaters operate to locate good luck maybee a little challange

Aug 30, 2009 | 2004 Chevrolet TrailBlazer

2 Answers

Dash vents will not blow air


It may be the mode actuator. Have you heard any clicking or other strange noise ? Under the drivers rear seat, in a plastic box is a fuse panel. Remove the two retainers, and the cover. Remove the HVAC or A/C fuse for a minute or two. Reinstall the fuse and this will make the A/C system relearn. Whwn you put the fuses back do not touch the A/C controls. Start the truck and leave it run for two or three minutes. Then try to change the vent from floor to vent and defrost. If this does not work you will need a mode motor. Good Luck

May 22, 2009 | 2006 GMC Envoy

1 Answer

HVAC vent selector does not function. Air flow is


THe blend door seems to be stuck. When you change settings from defrost to floor air or, vent, the blend door opens and closes directing the air to the place you want it to go to. I have had some success spraying a lubricating oil such as WD40 under the dash on the blend door. You need to get under the dash with a flashlight to locate it. It looks like a flap. Spray it with a couple of shots of the WD40. Go easy on the spraying as you may be inhaling the fumes. Keep the doors and windows open to minimize the fumes. Wait about 1/2 hour and try the A/C functions. (defrost, floor, vent air)

Mar 09, 2009 | 2002 Buick Rendezvous

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