Mysterious tube coming out of transmission, currently plugged.
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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 ...
  1. #1
    YueIBM is offline Cadillac Owners Member
    Automobile(s): 1999 Seville STS 226,000 miles, XC90 V8
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    Ann Arbor, MI
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    Question Mysterious tube coming out of transmission, currently plugged.

    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?

    THANKS!!!
    Attached Images

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  3. #2
    Submariner409's Avatar
    Submariner409 is online now If it won't run, slap in a big stereo
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
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    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.

  4. #3
    YueIBM is offline Cadillac Owners Member
    Automobile(s): 1999 Seville STS 226,000 miles, XC90 V8
    Join Date
    Dec 2009
    Location
    Ann Arbor, MI
    Posts
    19

    Smile Re: Mysterious tube coming out of transmission, currently plugged.

    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!

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