The Temperture control does not change air from cold to hot when the switch is turned.
Possible blend door issue. Either the blend door is stuck, or the actuator that is suppose to open and close the door is broken / no longer working. Common problem, and causes a LOT of headaches.
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I had this same problem, I replaced the blend door actuator behind the glove box. Its a little bit of a struggle but It can be done with a socket wrench and box wrench. Start by opening the glove box and pushing the sides in to let it hang down while you get back there. The unit was white in color on my truck. Just three small bolts hold it down. The bolt in back is the hardest but I just put the socket wrench on it and kept turning it.
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Vacume leakes under ur hood check it out
As
per your problem mentioned. There are few solved help links to
troubleshoot these problems. Go through the list and Click the link below:----
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http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html
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http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html
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http://technoanswers.blogspot.in/2012/04/1992-toyota-camry-ac-control-light.html
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These will help.
Thanks.
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