Question about 1998 Ford F150 Regular Cab

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Defrost blows cold air

Floor vents blow hot but panel and defrost blow cold to luke warm air . this seems to change with engine rpms some. more rpms more warm air.already changed the thermostat. thought maybe it was vacum somewhere but dont know where to look.can you help

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Sounds like you have a plenum door that is not opening when you go into defrost mode. You will have to check all your vacuum hoses and switching valves under the dash to see which one is not working. Hope this helps.

Posted on Jan 18, 2009

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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://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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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.in/2012/02/no-heatblower-blows-only-cold.html

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Ac vacuum line on dodge cummins?

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2005 Chrysler PT Cruiser: A/C Blows Warm?

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