Northstar Engines and System Technical Discussion Discussion, Mysterious tube coming out of transmission, currently plugged. in Cadillac Engine Technical Discussion; Hi Everyone,
I had a 6 months hiatus installing a replacement front cylinder head in my 99 STS and just ...
Re: Mysterious tube coming out of transmission, currently plugged.
That's the transmission vent. The metal cap wiggles - it's a vent - clips right there at the throttle cable bracket - so it pretty much sticks straight up from the transmission case. If the plastic clip is broken, use a black wire tie.
Look real hard in this pic...........click to enlarge. Just to the right of the top run of the purge line, next to the throttle cables.