Zuti
HVAC issues
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Advanced
Joined: Sep 2001
Posts: 74
Likes: 21
From: Ontario, Canada
HVAC issues
I'd like to know if anyone has experienced similar problems as I am about to describe with my C5. Hopefully you can give me a solution or at least give me enough knowledge that I can talk from an informed point of view when I go to the dealer with this one. I get no HVAC codes. Display always display what I select, but with no results.
Heater and A/C ducts all seem to disperse a little bit of air.. all of them.. all at once, regardless of the settings. For example, I can choose "floor" but it makes no difference.. all vents (floor, dash and defrost) all disperse a little bit of air. Makes no difference what mode I am in.. be it ventialtion, heat or A/C. Seems like the deflector doors in the vents are not functioning or ???
Any experiences/solutions out their?
Thanks..
Heater and A/C ducts all seem to disperse a little bit of air.. all of them.. all at once, regardless of the settings. For example, I can choose "floor" but it makes no difference.. all vents (floor, dash and defrost) all disperse a little bit of air. Makes no difference what mode I am in.. be it ventialtion, heat or A/C. Seems like the deflector doors in the vents are not functioning or ???
Any experiences/solutions out their?
Thanks..
Pro
Joined: Jun 2007
Posts: 631
Likes: 3
From: Joppa AL
You may have lost the vacuum supply to the system that moves the dampers in the box. It starts at the rear of the intake manifold and runs under the battery. Many have reported leaky batteries that eat holes in the vac lines. Try a search, there are lots of post on this issue. HTH
Drifting
Joined: Jun 2003
Posts: 1,510
Likes: 3
From: Life moves pretty fast... if you don't stop and look around once in a while, you could miss it!
CI 6-8-9 Veteran
I had the same problem it's probably a vacuum lince under the battery. I had a post with pics last year. I'll find it and post the link for you. It's a fairly easy fix. Zuti
Found the pics... here you go!
Found the pics... here you go!
Last edited by Zuti; Aug 10, 2007 at 10:08 PM.
Thread Starter
Advanced
Joined: Sep 2001
Posts: 74
Likes: 21
From: Ontario, Canada
Well, looks like I am really up the creek. The suggested diagnosis was correct.
However, looks like the battery acid travelled well up the vacuum line in both directions. The line is basically crumbs. The damage goes so far up each end of the line that I can no longer follow it to replace it. I have cut back some of the wrap on the harness where it goes through the firewall but can't go any further. The other end which I assume leads to the intake manifold, disappears "down below somewhere". The entire vacuum line will need to be replaced, and at what expense I can just imagine due to the tight spaces where it travels.
I guess the problem existed for quite a while resulting in the damage being quite extensive. It will probably cost a pretty penny to have that line replaced. There are other rubber items in the vicinity that have been damaged as well, but most of that is restricted to the acordian cover of one of the major harnesses.
Anyone have any suggestions before I get the armored truck and go to the bank??
However, looks like the battery acid travelled well up the vacuum line in both directions. The line is basically crumbs. The damage goes so far up each end of the line that I can no longer follow it to replace it. I have cut back some of the wrap on the harness where it goes through the firewall but can't go any further. The other end which I assume leads to the intake manifold, disappears "down below somewhere". The entire vacuum line will need to be replaced, and at what expense I can just imagine due to the tight spaces where it travels.
I guess the problem existed for quite a while resulting in the damage being quite extensive. It will probably cost a pretty penny to have that line replaced. There are other rubber items in the vicinity that have been damaged as well, but most of that is restricted to the acordian cover of one of the major harnesses.
Anyone have any suggestions before I get the armored truck and go to the bank??
Drifting
Joined: Jun 2003
Posts: 1,510
Likes: 3
From: Life moves pretty fast... if you don't stop and look around once in a while, you could miss it!
CI 6-8-9 Veteran
Well, looks like I am really up the creek. The suggested diagnosis was correct.
However, looks like the battery acid travelled well up the vacuum line in both directions. The line is basically crumbs. The damage goes so far up each end of the line that I can no longer follow it to replace it. I have cut back some of the wrap on the harness where it goes through the firewall but can't go any further. The other end which I assume leads to the intake manifold, disappears "down below somewhere". The entire vacuum line will need to be replaced, and at what expense I can just imagine due to the tight spaces where it travels.
I guess the problem existed for quite a while resulting in the damage being quite extensive. It will probably cost a pretty penny to have that line replaced. There are other rubber items in the vicinity that have been damaged as well, but most of that is restricted to the acordian cover of one of the major harnesses.
Anyone have any suggestions before I get the armored truck and go to the bank??
However, looks like the battery acid travelled well up the vacuum line in both directions. The line is basically crumbs. The damage goes so far up each end of the line that I can no longer follow it to replace it. I have cut back some of the wrap on the harness where it goes through the firewall but can't go any further. The other end which I assume leads to the intake manifold, disappears "down below somewhere". The entire vacuum line will need to be replaced, and at what expense I can just imagine due to the tight spaces where it travels.
I guess the problem existed for quite a while resulting in the damage being quite extensive. It will probably cost a pretty penny to have that line replaced. There are other rubber items in the vicinity that have been damaged as well, but most of that is restricted to the acordian cover of one of the major harnesses.
Anyone have any suggestions before I get the armored truck and go to the bank??
Thread Starter
Advanced
Joined: Sep 2001
Posts: 74
Likes: 21
From: Ontario, Canada
The battery I replaced last year did have a small leak. I didn't take out the battery tray at the time as all looked fine, just cleaned it up, but I guess some had dribbled down below it.
No question of that this time!
I am hoping you are not referring to the intake manifold.... not something I really want to have to get into doing.. have done enough of that in my younger days.... but if one must. I'll await your link if you can find it.
Thanks again for your steering me ...
The disappearing line you are refering to runs to a small vacuum port at the rear of the manifold. The manifold is relatively easy to remove and you should be able to re-run that vacuum line. I'm not sure going the other direction. There is a link here that shows how to remove the manifold. If I can find it, I'll post it. Good Luck Zuti
Thanks again for your steering me ...
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Drifting
Joined: Jun 2003
Posts: 1,510
Likes: 3
From: Life moves pretty fast... if you don't stop and look around once in a while, you could miss it!
CI 6-8-9 Veteran
thom,
here is the link. It's a fairly easy job, not at all like the old days. Hope this helps. Zuti
http://www.ls1howto.com/index.php?article=5
here is the link. It's a fairly easy job, not at all like the old days. Hope this helps. Zuti
http://www.ls1howto.com/index.php?article=5
Thread Starter
Advanced
Joined: Sep 2001
Posts: 74
Likes: 21
From: Ontario, Canada
Ended up taking the car to a friend's dealership... turns out TWO vacuum lines were all acid eaten and crumbled, plus the crumbs had been sucked into the intake, MAF and HVAC areas in the dash. They replaced the two lines and had to totally clean out areas of the intake as well as replace some plastic elbows etc. Huge job.... and a pain in my pocketbook, but it had to be done.