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Help identifying a vacuum tube

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Old May 16, 2026 | 08:42 PM
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Default Help identifying a vacuum tube
Can someone tell me what is this vacuum tube, small black tube coming out of the wiring harness near the firewall? And what does it connect to? 2002 c5 z06. Thank you.
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Old May 17, 2026 | 08:50 AM
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That’s the original vacuum source for your hvac control and air injection systems. It should have been connected to the rear of your intake manifold with a rubber connector.
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Old May 17, 2026 | 07:56 PM
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Originally Posted by tubegearhead
Can someone tell me what is this vacuum tube, small black tube coming out of the wiring harness near the firewall? And what does it connect to? 2002 c5 z06. Thank you.
You sure had me thinking something else when I read "vacuum tube."
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Old May 18, 2026 | 10:23 AM
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Originally Posted by eric22
You sure had me thinking something else when I read "vacuum tube."
KT88 perhaps?
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Old May 18, 2026 | 12:25 PM
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Originally Posted by redzg
KT88 perhaps?
It's been a LONG time, but that designation sounds somewhat familiar...
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Old May 26, 2026 | 12:28 AM
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Originally Posted by eric22
You sure had me thinking something else when I read "vacuum tube."
the reason I clicked on the thread.
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Old May 26, 2026 | 12:30 AM
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Originally Posted by redzg
KT88 perhaps?
Nope C5
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Old May 26, 2026 | 04:03 AM
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Originally Posted by redzg
KT88 perhaps?
ha ha, see my user name? I'm also into vacuum tube audio gear. Kt88's can boogie but I'm a big fan of El34 fat sweet mids. 😜
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