94 mustang 5.0 A/C problems


Old 05-29-05, 10:45 PM
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Unhappy 94 mustang 5.0 A/C problems

I have a 94 mustang 5.0 and the air conditioner seems to be stuck on defrost. It will not switch over to the vents. What could cause this? Is it a really hard fix? Will a garage charge an arm and a leg to fix it?
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Old 05-30-05, 03:54 AM
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Join Date: Jan 2001
Location: Kansas City, Missouri.
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It sounds like the blend doors are stuck. Often independent repair shops will not touch that kind of work, leaving the underdash work to the dealerships. Buy a Haynes manual and start poking around under your dash to find the blend doors. You may be able to fix it yourself.
Old 05-30-05, 04:05 AM
Join Date: Aug 2003
Location: Cape Cod
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I think the '94s were still a combo of mechanical and vacuum
It's tricky, and very tight under there, but it is possible it's DIYable
But you will have to do some poking around under there
Old 06-05-05, 02:09 AM
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check the nob,def,heat,vent, they like to break in side
Old 06-05-05, 03:07 PM
Join Date: Jun 2002
Location: Long Island, NY
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Sounds like the the vacuum line where it attaches to the plenum is cracked or broken. Very common on Fords, look for a black plastic line about 1/8" in dia. It breaks/cracks out of the rubber fitting that attaches it. Just pull the broken piece out and put back on.

The default when you lose the vacuum is defrost.

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