1997 wont blow out the center a/c vents, WHY? - Page 5 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 06-15-2005, 05:48 PM   #41
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to really confuse you more, check the junction box on the firewall, you will notice a black wire, this wire is connected to the Y in the vacuum line, YES it is a vacuum line and not an electric wire, it is the feeding line for the purple line going into that junction box.
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Old 06-15-2005, 06:11 PM   #42
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Default Re: HVAC thingy

Quote:
Originally Posted by nick *
Quote:
Originally Posted by Echo SSEI
Quote:
Originally Posted by james tharp
Ok all,

i thought maybe I was wrong, however there are absolutly no vacuum lines coming from the back of my hvac unit in the dash. None... there are six wires. I have pictures but am still learning how to let yu see them.
Maybe those "wires" are the vacuum lines. Nick, I am assuming the lines are small diameter that would resemble wires.
Yes those wires are the vacuum lines, I thought they were electric wires but they are not, they are vacuum lines that look remarkably like electric wires...........
James is looking at the back of the ECC control head, not the HVAC programmer. There are only wires connected to the control head. There are colored vacuum lines (pictured above) and one large electrical and one small electrical connector going to the programmer.





This is the location of the vacuum Y connector behind the passenger'* shock tower. There are two grommets under the plastic cover that extends from the master cylinder to the passenger'* shock tower. You must remove this cover to see them. The correct grommet is the one that is closer to the fender.
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Old 06-15-2005, 06:34 PM   #43
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I hope this helps

Here is the Y connector and the vacuum line that looks like an electric wire



close up of the vacuum line going into the jumper, it is tough to see it but it is a vacuume line.........

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Old 06-15-2005, 07:09 PM   #44
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Default Re: HVAC thingy

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Originally Posted by randman1

James is looking at the back of the ECC control head, not the HVAC programmer.
That explains a lot of our confusion. randman has come through again.
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Old 06-15-2005, 11:33 PM   #45
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Quote:
Originally Posted by randman1
You can also start the car and listen very closely to the inside of the glovebox. The black to purple connection is there. Listen for a hissing sound.
I have a hissing sound. Is this good or bad?
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Old 06-15-2005, 11:48 PM   #46
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Quote:
Originally Posted by Echo SSEI
Quote:
Originally Posted by randman1
You can also start the car and listen very closely to the inside of the glovebox. The black to purple connection is there. Listen for a hissing sound.
I have a hissing sound. Is this good or bad?
It sounds like you may have a vacuum leak, thats what it sounds like to me.
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Old 06-16-2005, 12:06 AM   #47
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Yep, a hissing sound isn't a good thing.

From what I remember, the black to purple vacuum line connection was pretty sturdy and didn't come apart too easily. This could be good news as it'* more likely that the leak is elsewhere and hopefully will eliminate the need to remove the dash. I'd start by removing the passenger'* hush panel and inspecting the lines in and out of the programmer. If the hissing is present when the ECC is turned off, the source (purple) line would be the problem. If the hissing is present while the ECC is on and in certain air flow modes, it will be one of the other colored lines or the diaphragms. I know you can see and reach at least one of the diaphragms from the driver'* side underdash.
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Old 06-16-2005, 01:03 AM   #48
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Trying to get these to show you all most got it figured out. Cant figure how to get them from putfile to here.

hmm maybe that did it?
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Old 06-16-2005, 01:05 AM   #49
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Default Re: PUT FILE PICS

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Trying to get these to show you all most got it figured out. Cant figure how to get them from putfile to here.

hmm maybe that did it?
No it didn't...
Email them to me at my home email and I will post them for you
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Old 06-16-2005, 01:10 AM   #50
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