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Old 07-16-2006, 09:06 PM   #1
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Heater Control won't switch off of Defrost???

I have a 94 mustang and the blower is stuck on the defrost setting. You can turn the knob to vent and it stays on the defroster. It gets cold with the air on but won't blow out the vents. Has anyone ever had this problem? How do I go about fixing it?
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Old 07-16-2006, 09:44 PM   #2
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vacuum line along fire wall in engine compartment could be shot. Do a search on this one - you can fix this one easily - good luck
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Old 07-16-2006, 09:47 PM   #3
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What do you think the best words to use in a search are, I tried doing a couple searches with no luck.
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Old 07-17-2006, 08:05 AM   #4
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I found a post about the vaccum tree under the hood around the firewall and heater core possibly being broke or a cracked line. Any other places to look?
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Old 07-17-2006, 08:41 AM   #5
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I don't know about those SN94 models, but here is the Fox. I did a search on "defrost". Took all of 17 seconds to come up with this post.

http://corral.net/forums/showthread....hlight=defrost
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Old 07-17-2006, 12:04 PM   #6
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That's the one I was thinking of too. DEFROST would be the keyword to use
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Old 07-17-2006, 01:12 PM   #7
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u can also make sure your vacuum canister is not busted check on the underhood id plate (where your engine&year is found) for a vacuum schematic
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Old 07-17-2006, 04:05 PM   #8
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hey man, I JUST had this same exact problem... Paul is exactly right, it's the vaccuum hose right along the firewall... it probably broke. It's a pretty thin hose, you should see it connect to a box on the driver's side... look for where it broke, and i used electrical tape. Works fine!!
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Old 07-19-2006, 05:40 PM   #9
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Heh, Great thread , Mine broke today i guess, i was like, why wont it turn off defrost damit..

Thanks, Gt Thomas, what kinda car you got? im from CC also . i drive a yellow 95 gt
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