If you can hear your blower motor running, and all setting speeds seem to work, it's most likely a vacuum problem on the blower doors as previously stated. It could be the selector switch itself that's not working properly.
Motor is bad
The selection door, is operated by 1/4" vacuum hoses. When turning the knob or sliding a lever, to select between floor, vents, or dash deck for windshield defrost, vacuum is created by the valve body and the blower will then blow thru the desired vents. When these hoses/lines are compromised, especially on a vehicle over 15 years old it seems likely, vacuum won't be created, and the last working position, is normally where it stays! Until the lines are replaced.
Good luck.
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.
When I turn on the heat in my 2004 mazda mpv
the front air vents blow heat but the rear air vents are blowing cold. I have adjusted every setting is there something I am overlooking.
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