AC vent problem 1994
Thread Starter
Cruising
Joined: Aug 2005
Posts: 12
Likes: 0
From: Independence MO
AC vent problem 1994
My AC vents aren't blowing. Air just comes out from the floor and defroster. I've seen the problem mentioned here before so the first thing I tried was replacing the vacuum check valve on the engine rt side. That didn't fix it so I want to check the AC programmer The shop manual says that its above the accelerator, but I removed the seat cushion and crawled under and can't find it 
Anyone know where to find it? Thanks for any help!
Anyone know where to find it? Thanks for any help!
Drifting
Joined: Nov 2005
Posts: 1,324
Likes: 5
From: Charlotte NC
I've never looked for it on my '93, but on my buddy's '91 it was very far up above the accelerator...in that area. It's obvious since it has a muti-colored 'octopus' of vac lines coming off of it. It's a real PITA to remove since you have to get that vac connection off before you can actually remove the controller....ask me how I know. (I'm too good a friend) 
By the way, that solved his problem with similar symptoms. His differed in that when he turned the car on, he could choose a vent output, but then it locked to that output.
BTW...glad to hear your seats are switchin'!
By the way, that solved his problem with similar symptoms. His differed in that when he turned the car on, he could choose a vent output, but then it locked to that output.
BTW...glad to hear your seats are switchin'!
Last edited by jimg's'93; Jul 15, 2009 at 11:24 PM.
Drifting
Joined: May 2005
Posts: 1,336
Likes: 12
From: Chicago Executive Airport, formerly known as Palwaukee
No-IL Events Coordinator
St. Jude Donor '12-'13-'14-'15-'16-'17
The A/C programmer is above the accelerator pedal. Some guys remove the driver's seat to make it easier to service.
The nipples in the vacuum connector collapse and prevent the vacuum from flowing.
I cut off the ends of the nipples on my '96. Then reinstalled. Problem solved! No need to buy any parts. Priceless, for sure!
Save the Wave!
The nipples in the vacuum connector collapse and prevent the vacuum from flowing.
I cut off the ends of the nipples on my '96. Then reinstalled. Problem solved! No need to buy any parts. Priceless, for sure!
Save the Wave!
Le Mans Master
Joined: Mar 2004
Posts: 8,700
Likes: 298
From: Ft. Lauderdale Fl
Always go with the easy and cheap first....for under $5.00, change your vacuum check valve. 
Thats what it looks like....and under a minute to install.
Its located under your right side fuel rail cover.
Thats what it looks like....and under a minute to install.
Its located under your right side fuel rail cover.
Last edited by runner140*; Jul 16, 2009 at 07:56 AM. Reason: added its location
Thread Starter
Cruising
Joined: Aug 2005
Posts: 12
Likes: 0
From: Independence MO
I was hoping that it was the check valve so I tried that first but no dice. I looked for the programmer up above the accelerator but didn't see it. Do you have to remove a panel or pull down some carpeting to find it or should it be right there 
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Pro
Joined: Mar 2008
Posts: 579
Likes: 2
From: High Bridge New Jersey
It's
My AC vents aren't blowing. Air just comes out from the floor and defroster. I've seen the problem mentioned here before so the first thing I tried was replacing the vacuum check valve on the engine rt side. That didn't fix it so I want to check the AC programmer The shop manual says that its above the accelerator, but I removed the seat cushion and crawled under and can't find it Anyone know where to find it? Thanks for any help!
Anyone know where to find it? Thanks for any help!
Drifting
Joined: May 2005
Posts: 1,336
Likes: 12
From: Chicago Executive Airport, formerly known as Palwaukee
No-IL Events Coordinator
St. Jude Donor '12-'13-'14-'15-'16-'17
The programmer is a 5-6" square black box. At one corner is a vacuum fitting with about 7-8 vacuum hoses (different colors) attached to it. It is directly above the accelerator pedal.
One must remove a bolt at the bottom (I believe) and then the assembly will drop down. Remove the clip holding the vacuum hoses and pull the connector from the box.
The back of the box is the most expensive piece of cardboard ever to find its way into a Corvette!
SAVE the WAVE!
One must remove a bolt at the bottom (I believe) and then the assembly will drop down. Remove the clip holding the vacuum hoses and pull the connector from the box.
The back of the box is the most expensive piece of cardboard ever to find its way into a Corvette!
SAVE the WAVE!
!!
Burning Brakes
Joined: Apr 2009
Posts: 877
Likes: 0
From: Broken Arrow Oklahoma
It's not on the firewall on my 90. It's mounted to the dash, look up and toward the rear of the car, you should see it.It will have a vacuum cluster and a blue electrical connector. First thing you need to do is remove the interior pieces. Take the push clip off of the vacuum cluster first. the hoses are not long enough to let you pull it down. use a small flat head screwdriver. remove the one nut (9 or 10 MM).then snake it out.
The older C4's used a collector that was hard plastic, the newer cars had softer rubber and they tend to suck closed with the vacuum .
The older C4's used a collector that was hard plastic, the newer cars had softer rubber and they tend to suck closed with the vacuum .
Le Mans Master
Joined: Mar 2004
Posts: 8,700
Likes: 298
From: Ft. Lauderdale Fl
Le Mans Master
Joined: Mar 2004
Posts: 8,700
Likes: 298
From: Ft. Lauderdale Fl
The programmer is a 5-6" square black box. At one corner is a vacuum fitting with about 7-8 vacuum hoses (different colors) attached to it. It is directly above the accelerator pedal.
One must remove a bolt at the bottom (I believe) and then the assembly will drop down. Remove the clip holding the vacuum hoses and pull the connector from the box.
The back of the box is the most expensive piece of cardboard ever to find its way into a Corvette!
SAVE the WAVE!
One must remove a bolt at the bottom (I believe) and then the assembly will drop down. Remove the clip holding the vacuum hoses and pull the connector from the box.
The back of the box is the most expensive piece of cardboard ever to find its way into a Corvette!
SAVE the WAVE!
Instructor
Joined: Apr 2009
Posts: 112
Likes: 0
From: Cedar Rapids Iowa
Thread Starter
Cruising
Joined: Aug 2005
Posts: 12
Likes: 0
From: Independence MO
I've been trying to get a picture of this before I take out the seat and crawl 
my way in. Is it possible to see the programmer under the dash? I tried holding my cell phone camera at various angles and blindly taking a pix in hopes of seeing it, but so far I haven't found it.
my way in. Is it possible to see the programmer under the dash? I tried holding my cell phone camera at various angles and blindly taking a pix in hopes of seeing it, but so far I haven't found it.
Pro
Joined: Mar 2008
Posts: 579
Likes: 2
From: High Bridge New Jersey
Not
I've been trying to get a picture of this before I take out the seat and crawl my way in. Is it possible to see the programmer under the dash? I tried holding my cell phone camera at various angles and blindly taking a pix in hopes of seeing it, but so far I haven't found it.
my way in. Is it possible to see the programmer under the dash? I tried holding my cell phone camera at various angles and blindly taking a pix in hopes of seeing it, but so far I haven't found it.