Question about 2002 GMC Sierra

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The fan only blows air out of the dash to the windshield no matter what the controls are set to,floor or vent ,i just replaced the battery could this have caused it?

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Test your vacuum lines for leaks. The ventilation louvers are vacuum controlled through the selector in most vehicles, though I am not certain for your particular vehicle.

Alternatively, your controls may have an electrical issue if you have automatic temperature control etc. Try disconnecting the battery to reset the computers and try again.

If there are no leaks and resetting does not help, I would suspect that the controls have a problem or your louver is stuck.

Posted on Oct 04, 2009

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Posted on Jan 02, 2017

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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

Tip

Tips for operating Air conditioning system on Toyota Hilux and someother...


To cool off your Toyota after it has been parked in the hot sun, drive with the windows open for a few minutes. This vents the hot air, allowing the air conditioning to cool the interior more quickly.

Make sure the air intake grilles in front of the windshield are not blocked (by leaves or snow, for example).

On humid, do not blow cold air on the windshield. The windshield could fog up because of the difference in air temperature on the inside and outside of the windshield.

Keep the area under the front seats clear to allow air to circulate throughout the vehicle.

On cold days, set the fan speed to high for a minute to help clear the intake ducts of snow or moisture. This can reduce the amount of fogging on the windows.

When driving on dusty roads, close all windows. If dust thrown up b the vehicle is still drawn into the vehicle after closing the windows, it is recommended that the in intake be set to FRESH and the fan speed to any setting except "OFF".

If following another vehicle on a dusty road, or driving in windy and dusty conditions, it is recommended that the air intake be temporarily set to RECIRCULATE, which will close off the outside passage and prevent outside air and dust from entering the vehicle interior.

HEATING

For best results, set controls to;
Fan speed ---- Any setting except "OFF"
Temperature----Towards WARM (red zone)
Air intake ---- FRESH (outside air)
Air flow ---- FLOOR
Air conditioning ---- OFF

For quick heating, select recirculated air for a few minutes. To keep the windows from fogging, select fresh after the vehicle has been warmed.

Press the "A/C" button on for dehumidified heating.

Choose floor/windshield air flow to heat the voltage interior while defrosting or defogging the windshield.

AIR CONDITIONING

For best results, set controls to;

Fan speed --- Any setting except 'OFF"
Temperature --- Towards COLD (blue zone)
Air intake --- (outside air)
Air flow --- PANEL
Air conditioning --- ON

For quick cooling, move the air intake selector to recirculate for a few minutes.

VENTILATION

For best results, set controls to;

Fan speed --- Any setting except 'OFF"
Temperature --- Towards COLD (blue zone)
Air intake --- (outside air)
Air flow --- PANEL
Air conditioning --- ON

DEFOGGING

The inside of the windshield

For best results, set controls to:

Fan speed --- Any setting except 'OFF"
Temperature --- Towards WARM (red zone) to heat; COLD (blue zone) to cool
Air intake --- FRESH (outside air)
Air flow --- WINDSHIELD
Air conditioning --- ON

The outside of the windshield

For best results, set controls to:

Fan speed --- Any setting except 'OFF"
Temperature --- Towards WARM (red zone)
Air intake --- FRESH (outside air)
Air flow --- WINDSHIELD
Air conditioning --- OFF

On humid days, do not blow cold air on the windshield. The windshield could fog up because of the difference in air temperature on the inside and outside of the windshield.

DEFROSTING

The outside of the windshield

For best results, set controls to:

Fan speed --- Any setting except 'OFF"
Temperature --- Towards WARM (red zone)
Air intake --- FRESH (outside air)
Air flow --- WINDSHIELD
Air conditioning --- OFF

To heat the vehicle interior while defrosting the windshield, choose floor/windshield air flow.

on Feb 14, 2011 | Toyota Pickup Cars & Trucks

1 Answer

Heater blows air thru floor vents and dash vents but no air thru defrost windshield vent


Suspect a defective blend door actuator motor that controls airflow for the defrost. This electric motor may be defective and in some makes and models can be extremely difficult/expensive laborwise to replace

Jan 05, 2016 | 2008 Jeep Patriot

2 Answers

Fan blows but won't air blow out of vents?


You have a problem either in the control head, which is usually a vacuum issue, or under the dash in the blend box, which could be a vacuum or mechanical issue with respect to the blend doors.

Dec 01, 2015 | 2000 Pontiac Montana

2 Answers

Ac air does not come out on the dash boared vent but blows on windshield. what is the problem?


there will be a air flow setting knob that controls whether air is defrost or on feet or from the console vents.

Feb 07, 2015 | 2001 Lexus RX 300

1 Answer

96 Grand Am 2.4l A/C not equipped - Lots of cool air through vent. Almost no air to defrost. Blows hard to floor (great temp mix). Every vent setting? Mech just replaced heater core? What? Fine before


Looks like your mechanic messed up. If he has any integrity then he should take care of you. If not and you want to try and tackle it yourself then you have to ask yourself this: do I want to pull the dash out? Because that is what that will entail. Sounds like he may have messed up the ducting somehow. Unless the blend doors and directional doors are electric actuator operated in which case those actuators need to be replaced

Jan 17, 2014 | 1996 Pontiac Grand Am

1 Answer

Air blend door actuator


Possible bad blend door actuator .some gm cars can be relearned to the new climate control head

Jul 28, 2013 | 2001 Oldsmobile Aurora

1 Answer

I have a 2001 9-5 SE V6 with about 88.5K miles. The interior fan air only blows out of the face/dash vents no matter what position (feet, windshield, or face) the indicator shows. Fan speed and temp work...


2 possible problems, #1 is the control switch on the dash has malfuntioned(less likely) , #2 is the motor under the dash that changes the blower position is not working properly.

Please rate my answer ............Thanks

Dec 02, 2010 | 1999 Saab 9-5

2 Answers

A/C blows cold on floor and windshield, not thru dash vents


you have a vacuum leak check the vacuum hoses behind the controll panell

Jun 05, 2009 | 1991 Buick Park Avenue

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