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Discussion Starter #1
While tinkering on the truck I found this vacuum line just hanging loose. I can not see where it should connect so I stuck a screw in it to stop the vacuum leak. Can someone trace it back in their truck? This is a 2001 s10 auto. Many thanks!
 

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terrible. take a lap.
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i have a 2001 s10 4.3 also...heres what mine looks like...


wait a second, scratch that, my pic isnt useful, ill follow that line to see where it goes exactly...my bad.
 

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terrible. take a lap.
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here ya go, it goes straight to the firewall...maybe theres something there that it hooks onto, but i didnt feel like taking mine apart...sorry..i'm sure it'll help though!
 

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its for your blending doors in your hvac system, its almost impossible to get it reattached its for a small tank in the fender. you can just cap it off and it will be fine.
 

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really? you lucked out, on my 2000 ZR2 its inside the fender and i couldnt reach it or see it.
 

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terrible. take a lap.
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its for your blending doors in your hvac system, its almost impossible to get it reattached its for a small tank in the fender. you can just cap it off and it will be fine.
if i plug the one on mine since my system blows hot air out, will it stop that? lol
 

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You sure that's for te HVAC? i thought that was a charcoal filter in the fender... not that i'm sure either but i was replacing the dried out lines a couple months ago and thought my haynes said it was for emissions... i could go look but i'm lazy..
 

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well when i got my zr2 it didnt switch at all from the vents and when i capped that off it started working.
 

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hmm, sounds like i may have to take a look at mine. when driving with the HVAC off on the highway my vents blow hot air... i think it is a chevy thing.
 

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Discussion Starter #12
I have fiberglass fenders so it's pretty easy to get to stuff in there. Will report back tomorrow.
 

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Discussion Starter #14
Well, it looks like I , or someone, removed whatever this vacuum line went to. I'm just going to go ahead and leave it capped. Thanks for the help guys.
 

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Wire Splicin Fool :-)
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The check valve gives it away as the line for the Vac cannister, you may notice when going uphill your vents change without the cannister (or when there is a load/ low vac on the engine.)

I built a vac canister out of a piece of PVC pipe and 2 endcaps for my old cavalier one time.
 

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Yes, there IS a vacuum canister inside the fender and you should plug it in.
 

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Discussion Starter #18
I have fiber glass fenders so the inner fender well has been trimmed back. I did this a while ago and I don't remember exactly what I had to remove but there are 2-3 holes here and there where something like the vac canister could have been mounted. I have no prob with my vents changing when I drive up hill. Now, if this were to cause problems like a rough idle or hesitation at part throttle then yes, I will look into it and fix whatever the issue is.
 

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To solve the hot air problem, open glove box and tilt it to the floor, now look behind it and you will see a gray HVAC hose. disconnect it and plug the hose, problem solved. This is for 98+.
The vac line goes to the canister located inside the drivers fender. I was able to access it when I changed the vac lines on a 98 s10.
 
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