Defrost air only
Thread Starter
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New User
Joined: Feb 2006
Posts: 13
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Defrost air only
Hi guys, I have a 90 superduty 7.3IDI regular cab,& only get air out of the defrost. I think all hoses are ok. It doesnt matter where you put the ****, defrost,floor, vent, etc. it only comes out defrost. Thanks for any help.
Post Fiend
Joined: Nov 2003
Posts: 21,285
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From: Nutter Fort, WV
How are your brakes?
If you really have to push down on the pedal I would say your vacuum pump is dead.
The heater defaults to defroster when there is no vacuum.
If the brakes are working good, then I would make a second guess that something has fallen into the defrost vent and is blocking the door from moving.
Did you check the vacuum lines under the dash?
If you really have to push down on the pedal I would say your vacuum pump is dead.
The heater defaults to defroster when there is no vacuum.
If the brakes are working good, then I would make a second guess that something has fallen into the defrost vent and is blocking the door from moving.
Did you check the vacuum lines under the dash?
Thread Starter
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New User
Joined: Feb 2006
Posts: 13
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Thanks Dave, My brakes seem fine,& i have not checked vacuum lines, but i will 2morrow. I havent noticed any vacuum leak noise but, I guess that would be hard with engine running. As for as something in the vent I'll check that too. Thanks.
Senior User
Joined: May 2001
Posts: 345
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the hinge on the diverter door is a strip of metal tape & often breaks which then doesn't allow air flow to anywhere but the defroster, thats whats wrong with mine but i need to remove the dash to fix it so i'm waiting for a bit nicer weather.
