Question about 2005 GMC Sierra

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At times the ac will blow very hot air on the driver side vents upper&lower and rear lower console vents. All passenger side vents function properly when this happens. Sometimes it starts off ok then malfunctions. What could be causing this? I brought to GMC and since nothing was on the diagnostics, they could not fix the problem.......useless........ Jaime

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The problem can be broken or blocked blend door or the broken blend door actuator.It has to be checked. The heat in that vehicle is controlled by blend doors that regulate heated air flow. They are operated by an electric motor/actuator. The problem can be that the actuator is stripped or inoperative or the door itself could be damaged. This is what needs to be determined by examining the actuator for that side and see if it is responding to heat change commands or not. The other possibility is to check the coolant leak the level of freon gas in ac .If the level is low then getting the freon refilled will clear the problem.But if its the coolant leak then,The leak has to be tested.Get the coolant pressure test done for ac.at any local car garage they do pressure test for ac.Get it done to confirm if there is any leak of coolant.This will lead you test other possibilities if pressure test checked ok. Also check the vent doors are they fully open or closed.Also are the door getting blocked by any object. The other problem to check the switch.The ac switch.If that switch is not turning the AC ON in driver side then this can be the issue. Thanks. keep updated for any more query.you can rate this solution and show your appreciation

Posted on Jul 12, 2010

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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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No heat on Oldsmobile Silhouette?


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

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

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

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

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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

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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

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These will help.

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

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Hot air on the driver's side vents only?

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

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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

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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

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

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http://technoanswers.blogspot.com/2012/01/ford-ranger-ac-blows-cold-through.html

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http://whoisbyme.blogspot.in/2012/06/2005-chrysler-p8t-cruiser-ac-blows-warm.html


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

2009 Mercury Grand Marquis: A/C blows Cold From Defrost Vent Only?

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