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Anonymous
Anonymous Posted on Jun 27, 2012
Answered

A/C will only blow through defrost vents

The A/C and heater will only blow through the defrost vents. The tempeture works just fine, blows cold air when at 60 degrees and blows hot when set to 90 degrees. I can not change the air or heater to blow through any other vents even if I switch it to another vent, will only blow through defrost.

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2 Answers

Stephen

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  • Acura Master 21,873 Answers
  • Posted on Jun 28, 2012
Stephen
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Common question on this site. On late model cars, the vents are controlled by blend door motors. Small electric motors open and close doors to direct air flow.
Chances are you have a blend door that is stuck or a failed motor.
The default position is the defrost to make sure the windshield is always clear.
Someone will need to look behind the dash to see if all of the doors will move on demand.

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  • Posted on Mar 11, 2014
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No one seems to know how the switch moves the doors???

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5 Related Answers

roniecon

Ronny Bennett Sr.

  • 6988 Answers
  • Posted on Jul 05, 2009

SOURCE: air cinditioning blowing from cold to hot air

need to check ac fan or fans ,are they working? if not check fuses and fan relays,,,,,and fans (hot wire the fan to see if it/they work

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Anonymous

  • 150 Answers
  • Posted on Apr 18, 2009

SOURCE: A/c only blowing cold air out of the passenger vents. Warm out of the drivers

check the refrigerant level a low charge will do this due to only half of the evaporator is working from low charge

Anonymous

  • 2920 Answers
  • Posted on Jan 24, 2009

SOURCE: 1996 Acura TL Heater blows cold air when stopped

the heater core could be clogged you might again check your coolant level just to be sure its full

Anonymous

  • 580 Answers
  • Posted on Jul 09, 2009

SOURCE: Heater/Cooling problems on 2000 Acura RL

Check the fuse for your blower motor if it is OK the Blower Motor may be bad or you may have a loose wire to or from the it have it checked if fuse is good

Anonymous

  • 10 Answers
  • Posted on Dec 27, 2009

SOURCE: heater fan only blows on dash vents and not on

the simplist answer is the cable is disconnected from the diverter valve if it;s a manual lever or the vacuum damper is bad that operates the diverter. Lok under the dash board to find.

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As per your problem mentioned. There are few solved help links to troubleshoot these problems. Go through the list and Click the link below:----

2000 Toyota Avalon: No heat on Passenger Side?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-no-heat-on-passenger.html


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These will help.

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Read full answer
Nov 28, 2012 • Cars & Trucks
0helpful
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No heat from vents

As per your problem mentioned. There are few solved help links to troubleshoot these problems. Go through the list and Click the link below:----

2000 Toyota Avalon: No heat on Passenger Side?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-no-heat-on-passenger.html

------------

No heat on Oldsmobile Silhouette?


http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html

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Heater blows cold?

http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

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Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

----------

Hot air on the driver's side vents only?

http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html

--------------

Temperature gauge does not move and no heat when heater is ON?

http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html

-----------

1992 Toyota Camry: A/C Control light Flashing and A/C not Blowing Cold?

http://technoanswers.blogspot.in/2012/04/1992-toyota-camry-ac-control-light.html

--------------


No heat, blower blows only cold?

http://technoanswers.blogspot.in/2012/02/no-heatblower-blows-only-cold.html
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Ford F150 Ac only blows through defrost vents?

http://technoanswers.blogspot.com/2012/01/forf-f150-ac-only-blows-through-defrost.html

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http://technoanswers.blogspot.com/2012/01/dodge-ac-come-out-of-defrost-vents-only.html

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Ac vacuum line on dodge cummins?

http://technoanswers.blogspot.com/2012/01/ac-vacuum-line-on-dodge-cummins.html

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http://schematicsdiagram.blogspot.in/2012/04/ac-not-blowing-through-vents-on-2007.html

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http://schematicsdiagram.blogspot.in/2012/04/passenger-side-temperature-is-warm-air.html

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These will help.

Thanks.

Read full answer
Nov 28, 2012 • 2006 Ford Taurus
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On my sons 2000 chevy silverado 4.8 liter....the heater works fine....but when i switch control to defrost....only cold air blows out defrost vents....any help would be appreciated.
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