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Old 05-11-2005, 09:32 PM   #1
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Default AC controls not working

I think I saw a mention of a similar problem on these forums somewhere, but I've no idea where. Anyway, I sued my AC for the first time today and the air refused to come out of the vents, it owuld only blow out of the defroster and out the bottom on the feet. The AC compressor was definitely on and working as the air was plenty cold, but it'd be nice if it blew out the right place. I'm hoping this is a quick/easy fix as I'm planning on leaving for a cross country road trip tomorrow.
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Old 05-11-2005, 10:12 PM   #2
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probably not quick and easy. Sounds like the door that diverts the air down the right passages in the air box is stuuck. ANd that'* not gonna be an easy task. Wait for someone who will know more about your era to chime in.


Nate
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Old 05-11-2005, 10:18 PM   #3
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The air flow is diverted to defrost in the event of a vacuum loss to the system. Reconnect or repair the vacuum line at the vacuum reservoir under the hood.
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Old 05-11-2005, 11:06 PM   #4
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Ok. Where would I find these vacuum line and vacuum resevoir under the hood? I can't seem to find anything about vacuum lines or a box in my haynes manual, but I'm never eral good at finding stuff in this book.
I've found the blower motor and where that all seems to be, but I'll be damned if I can find any vacuum lines, I did look under the dust shield thats held on by the 7/32 nuts and jsut found a bunch of plugs.
Besides that, if there needed to be vacuum to operate the vents instead of the defroster, wouldn't the engine have to be on to run the vent? I know thats not supposed to be the case. I suppose it gets its vacuum from some other palce than the engine, the blower fan?
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Old 05-11-2005, 11:34 PM   #5
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Quote:
Originally Posted by theprodigalstranger
Ok. Where would I find these vacuum line and vacuum resevoir under the hood? I can't seem to find anything about vacuum lines or a box in my haynes manual, but I'm never eral good at finding stuff in this book.
It'* not you... personally, I think the Haynes manuals blow.

Here'* a pic that I used for another topic so the graffiti doesn't apply:
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The vacuum reservoir is the black thing to the left of the master cylinder. The arrowhead for "No vacuum booster" tag is partially on it. It is in the same relative position as the one in my 93 as shown below:
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Quote:
Originally Posted by theprodigalstranger
Besides that, if there needed to be vacuum to operate the vents instead of the defroster, wouldn't the engine have to be on to run the vent? I know thats not supposed to be the case. I suppose it gets its vacuum from some other palce than the engine, the blower fan?
That'* the reason for the reservoir in the first place. It "stores" vacuum pressure so the vacuum operated accessories will work for a period of time without a source (the running engine)
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Old 05-12-2005, 12:31 AM   #6
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Cool, thanks. NOw if I can find my flashlight I'll be set
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Old 05-12-2005, 12:51 AM   #7
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Well by jove that was easy. One of the hoses was disconnected, no idea how that happened. Didn't even need a flashlight, did it by lighter fire. Thanks for the help.
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Old 05-12-2005, 07:46 PM   #8
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The line deteriorated. Mine will occasionally pop off, too. Makes my car idle like it has a radical cam too. If it comes off again, you can replace it, or use a zip-tie or rubber band to hold it on.


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Old 05-15-2005, 01:11 PM   #9
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I think I may have the same problem but the only difference is when i slap the dash hard sometimes the air will come out the right vents. Do i have the same problem or is mine the door?
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Old 05-15-2005, 01:24 PM   #10
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My guess would be a sticking vacuum diaphragm but it'* very easy to check the line as indicated above.

I recall another thread several months ago where someone had a faulty servo. You may want to try the search function to locate it.
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