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Anyone know what this is ??
#776799 May 27th 2021 6:59 pm
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Found this object sticking out of my firewall today that I've never actually noticed before. (Don't know why) but it appears to be perhaps a valve of some sort, silver in color, with a hex head cap on it, but not exactly sure as I didn't try unscrewing it. ( its just above the air cleaner reset button in the picture) Doesn't appear to be an a/c valve ,just wondering if anyone had a clue what it is or what purpose it serves. Any help would be appreciated. Thanks in advance for your help.

Attached Files 20210527_174224.jpg
Re: Anyone know what this is ??
Gnarlyfoot #776809 May 28th 2021 12:10 am
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Rust N Dents
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I'm guessing it's a late '90s-early 2000s Express van?


[Linked Image]
Re: Anyone know what this is ??
Gnarlyfoot #776870 May 29th 2021 5:40 pm
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Just a cap for an unused stud GM put on the firewall for some option that was available in the lineup. Never have seen a CNG optioned van in person but I have a feeling the stud held something on it related to it.


1983 G20 Conversion Van, 350 TPI, Reed Hydraulic Roller cam, Ported 906 Vortec, Edelbrock 3817 TPI-Vortec Base, Doug Thorley Tri-Ys, Dual 2 1/2" exhaust, Speed Density 7730 ECM tuned by ME, 700r4 by ME, Stock 1,600 rpm converter, Rebuilt Stock 10 bolt with posi by ME, 3.08 gears, 358 RWHP @ 5,200, 384 RWTQ @ 3,400, 14.66 @ 95.43 w 2.28s 60'
Re: Anyone know what this is ??
Gnarlyfoot #776872 May 29th 2021 5:54 pm
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Could be a Turbo Encabulator.
https://www.youtube.com/watch?v=fw_VBiTntq8


I've never seen a thin person drinking diet coke......
Re: Anyone know what this is ??
Rusty_Pancelode #776949 May 30th 2021 11:51 pm
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Yes it is a 2001 Express

Re: Anyone know what this is ??
Gnarlyfoot #776951 May 31st 2021 1:47 am
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Originally Posted by Gnarlyfoot
Yes it is a 2001 Express

I just wanted to make sure we all knew what we were looking at.

I recognized the cowl as an Express and knew the air filter indicator things were from that era, so I ventured a guess.
Unfortunately, I have no idea what that doo-hickey is for.


[Linked Image]
Re: Anyone know what this is ??
Gnarlyfoot #776953 May 31st 2021 7:57 am
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I have the same thing on my 99 Tahoe. Located on top of the plastic ducting right after it exits the air filter box. Say "Press to Reset". I was looking at the wrong thing, I now see the part in the firewall. Have to look and see if my 99 has that.

Last edited by Meanmachine; May 31st 2021 8:53 am. Reason: sp
Re: Anyone know what this is ??
Gnarlyfoot #776954 May 31st 2021 8:59 am
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On that location on the firewall on my Tahoe, there is some plumbing for the AC coming through the firewall. Does your van have AC or possibly at one time was equipped with it.

Re: Anyone know what this is ??
Gnarlyfoot #777014 June 02nd 2021 2:59 am
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GM built these vans ready to go for most options so a lot of them have some redundant parts. For instance my 2002 express has power windows/locks/mirrors, so it also has all the wiring for cruise control, but is not equipped. I suspect if you can find one with the tilt/cruise package but manual windows, it will have some of the wiring for power windows also.


1994 G20
2002 Express, sitting dead
1988 G20 conversion, stored
Re: Anyone know what this is ??
Meanmachine #777036 June 02nd 2021 2:50 pm
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Yes the van does have air conditioning, and as far as I can tell no lines are running near the object in question. It does not appear to be any kind of a/c charging port either. Very strange item indeed. Oh well the world may never know. Lol. A lot of my friends say: W.G.A.F. anyway. 😃 Thank you to everyone who's responded anyhow.

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