94 AC/Defrost vent issue

[pup55]

Dear Forum Dwellers:

I have a nice old '94 'stang, it's just a 6 cyl, and will never see the track but it runs fine and it's a mustang. Also, despite 125K miles, it is still getting about 29 mpg if the wind is blowing right.

I have been having trouble with the A/C vent/blower. The AC blows cold, the fan works, but even with the switch in the AC position, the air blows out of the defroster vents and also the floor vents, and not out of the dashboard vents, where it is supposed to cool down my face. Even on "vent" the air blows out of the defroster.

Although it is not all bad having cold air blow on my crotch and also the top of my head, I would rather have it work right.

There is obviously some kind of flapper valve that directs the air either out the vents or up the defroster, and this thing is stuck.

Questions:
a. Where is it? How much of a pain in the neck is it to get to?
b. Does it run by electrical or by vacuum, or by cable or somethng, like the old ones used to.
c. Will it work to plug up all but one of the vents, and then blow compressed air down there backwards to free it up?
d. Other suggestions?

 

[94CobraPace]

On the 5.0's there is a vacuum tree on the drivers side fire wall that breaks and causes a leak. The vacuum hose controls the vent location. Check on the fire wall for any vacuum hoses that have came apart or broken.

 

[The Green GT]

I think the 3.8's have th same vacuum tree.

 

[pup55]

Thanks for all of your help.

Sure enough, I went out and looked at it, and the small vacuum hose that connects to the spigot marked "ac" is broken. Looks like a piece of cake to swap it out. I think about a two foot connector tube will do it.

I am sure glad I asked the question, because it probably would have taken me a day or two worth of profanity and knuckle skinning to figure this one out on my own.

Where's the best place to get another one? Ford garage? Auto store?

 

[1TallMF]

Wow, that was easy haha
I'd probably check-out the dealer and see how much they want for it, otherwise perhapse a junk yard or 50resto might have them.

Edit: 50resto only has these: http://www.latemodelrestoration.com/iwwida.pvx?;item?item_no=LRS-9490A%20%20%20%20%20%201&comp=LRS

 

[mo_dingo]

I just made a new one from brass pex plumbing T, some adapters and some new rubber hose.
Scott

 

[hayden lewis]

Can someone please upload a photo of this vacuum line. my ac ist stuck on defrost and no one can take the time to upload a damn photo, ps how do you create a new post on this site??? youd think theyd have a better interface

 

[CarMichael Angelo]

You don't see your post right away until it has been screened by a moderator. So far your wait has been 30 minutes, although it typically can take up to 24 hours for it to be released. Words of advice......you'll need to check your frustration at the door,..because the way you are asking for help may be taken as cocky.