SOURCE: defrost is not working. Volvo 1989 sw240
You have a problem with the vacuum operation of the dampers that control the direction of the airflow. You will need to pull the front panel of the console and look at the vacuum hoses that attach to the back of the control buttons. If those are attached, look under the dash to see if they are attached to the small bellows that control the dampers. You should pull the glove box out so you can see the damper under the dash to get a look at it and get an idea for how the other one looks. There is a second damper to the left of the one behind the glove box. Behind the bellows there is a small nipple that any loose hoses should be attached to. Take a flashlight along when you start exploring. If those are okay, check the other side.
SOURCE: Heat wont blow through heater or defroster vents
Had the same problem. believe it or not i changed the gas cap and got heat all around. something about pressure.
NO HEAT ON FLOOR VENTS
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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:----
http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-no-heat-on-passenger.html
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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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http://technoanswers.blogspot.in/2012/02/no-heatblower-blows-only-cold.html
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http://whoisbyme.blogspot.in/2012/06/2009-mercury-grand-marquis-ac-blows.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.
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