1998 Ford F150 Regular Cab Logo
Posted on Jan 18, 2009

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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  • Posted on Jan 18, 2009
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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.

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Blows hot air on the floor but cold in the defrost

most likely leak in one or more of the vacuum lines and or out door air damper not closing

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http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-no-heat-on-passenger.html


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