I have a 93 Ford Mustang GT Conv. All of a sudden my air conditioner stopped blowing out the front vents. I will blow from the top deforster vent, and from the floor vent but not out the front panel vents. I was told that it could be a vacume line that has come loose somewhere. I saw a white, blue, back, and red vacume line. Can someone show a diagram where these lines run from start to finish. Also which one would be to the front panel (white, blue, red, or black)?

 

Anyone seen this? I have a similar problem.. I get air (cold / hot/ ac) out of the defrost vents but nothing on the floor or dash vents?

86 GT 302 vert.

 

Same Car, Same Problem. Any solutions?

 

Check all the vacumm lines running along the firewall in the engine comp. There may be one that has wore through. Also look under the dash for some suspecious looking lines.

 

check vacuum supply line in the engine compartment...it is usually on the passenger side of the firewall by the heater core...make sure its not damaged or unhooked...
also these car have a big problem with the switch assembly itself cracking and leaking... listen for a hissing from inside the dash...

 

I had that problem too with the air only coming out of the defrost vent. I had put an aftermarket cd player in and snagged a line behind the radio. I found the line and slid it back on this little pump and it works fine now. I hope that helps!

 

I am having the same issue from my '94 conv. I will take a look at all the vac lines and let you know what i find. I remember it happened not to long after i did an obessesive cleaning pulling off any thing i could remove. thanks for the good info people.