: Mysterious tube coming out of transmission, currently plugged.

05-14-10, 11:11 PM
Hi Everyone,

I had a 6 months hiatus installing a replacement front cylinder head in my 99 STS and just found some time to start the project back up two weeks ago (engine-in-car)...

I found a tube coming out the top of the transmission that doesn't do anything while tightening down the crossover bolts that I had to loosen to squeeze in a new front head to water crossover gasket.

The tube is pictured below, with a metallic plug at the end and a plastic clip/bracket around the metallic plug. Is this how it's supposed to be?


05-15-10, 07:37 AM
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.

05-15-10, 12:28 PM
Wow. Thank you submariner409! I even looked through the FSM and couldn't find it!

Looks like you capped off the airbox resonator - how do you like it?

Thanks again for your help! Have a great weekend!