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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 12-19-2010, 02:54 PM   #11
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Originally Posted by BillBoost37 View Post
On the other side of the check valve that line turns back to plastic and heads down to the frame rail. From the frame rail it goes up under the passenger front fender where it feeds the vacuum canister. After the canister the line follows back along the frame and into the cabin as the purple supply line.
Is there supposed to be another vac line connected to the cannister? I just pulled it out, and there is only the feed line that comes from under the fuse cover. I verified the cannister is fed from that line. There is not another hose nipple on the cannister and no other hoses in the vacinity, so there must be another source feeding the HVAC programmer?
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Old 12-19-2010, 03:07 PM   #12
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Yep, that'* what it sounds like. There will be times that it'* on, and times when it'* off. When open you have a vacuum leak. So make sure it'* hooked up.
Should be connected now, I was careful when replacing the airbox, and watched to make sure it didn't disconnect.
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Old 12-26-2010, 04:13 PM   #13
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Well I just did some more tracing of vac lines. Tired of working on this thing, just did new front rotors/pads and upstream O2 sensor last night.

Just for future reference/FYI:
The vac line that feeds the programmer for vent control enters the vehicle through the outer firewall port on the passenger side under the maxifuse cover. The vac feed line 'T'* just below the check valve, where the line enters the harness loom (the loom from the firewall). One side goes into the vehicle, the other to the cannister/bottle under the battery.

I have good vac through the check valve, so it looks like I'll likely have to pull the programmer. Seems like the easiest fix is to just cut out the plastic plug and run the vac lines directly into the programmer. I don't think I'll bother with it until the weather gets nicer (like next June!).
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