Intercooler fill level?
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Cadillac STS-V Series Forum Discussion, Intercooler fill level? in Cadillac V-Series Forums; The filler for the intercooler is in the left rear (facing engine) of the compartment. It is an upside down ...
  1. #1
    Slo-Mo-Shun's Avatar
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    Intercooler fill level?

    The filler for the intercooler is in the left rear (facing engine) of the compartment. It is an upside down "T" spliced into a coolant hose. Mine apparently was installed backwards in that the markings for the fill level face the battery and thus cannot be fully viewed, even with an inspection mirror.

    So I need help. In the middle of the verticle part of the T the words Fill Level appear. There is an arrow up to the filler cap and another arrow down to the bottom of the T, but I can't make out what these arrows are supposed to mean.

    Do the arrows mean the intercooler cold fill level is at the bottom of the T and the hot fill is at the top (cap) level? If not, what is the proper cold fill level?

    Thanks.

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    CIWS's Avatar
    CIWS is offline Cadillac Owners 10000+ Posts
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    Re: Intercooler fill level?

    From the owner's manual. https://www.mygmlink.com/pdf/go2cont...ac/2006sts.pdf


    Park the vehicle on a level surface and turn off the
    engine. When the engine is cold, the coolant level
    should be at or above the FULL COLD line. The FULL
    COLD line has an arrow pointing to it.

    Adding Coolant

    If you need more coolant, add the proper DEX-COOL®
    coolant mixture at the intercooler fill neck, but only
    when the engine is cool. See Cooling System on
    page 5-33 for instructions on how to add coolant to the
    intercooler fill neck.


    How to Add Coolant to the Intercooler

    System Fill Neck (4.4L V8 STS-V
    Engine Only)

    If you have not found a problem yet, turn the engine off
    and allow it to cool down, then check to see if coolant
    is visible within the horizontal tube section of the
    fill neck. If coolant is not visible, add a 50/50 mixture of
    clean, drinkable water and DEX-COOL® coolant to
    the fill neck. Be sure the Intercooler System, including
    the Intercooler System pressure cap, is cool before
    doing so. See Engine Coolant on page 5-27 for more
    information

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    WillySTS is offline Cadillac Owners Enthusiast
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    Re: Intercooler fill level?

    Actually, the intercooler has its own cooling system resivour under the right side engine cover. Just make sure that it's kept about 1/2 full, just like the radiator surge tank.

    I know the manual says all of that, but if you didn't drain it and just want to maintain the level, do it this way...it works for me.

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    Slo-Mo-Shun's Avatar
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    Re: Intercooler fill level?

    Quote Originally Posted by CIWS View Post
    From the owner's manual. [url]. The FULL
    COLD line has an arrow pointing to it.
    Thanks. I'd already read the manual and it does not accurately describe what is on the "T" because there are two arrows and they both point AWAY from the "FULL COLD" language.

    The Horizontal portion of the T is empty right now, so I'm going to assume that "full cold" means I should see fluid in the horizontal section, but not in the verticle pipe.

    Thanks

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    Re: Intercooler fill level?

    What T are you talking about? There is a resivour for the fluid that looks like a break fluid resivour. It can't be installed upside down. You would never get fluid in it in the first place. You must be looking at the wrong thing.

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    Re: Intercooler fill level?

    Between the battery and the engine cover there is a T-shaped filler with a screw-on pressure cap. The owners manual says this is the fill spout for the intercooler. The spout is attached by a hose to a coolant recovery tank on the right (passenger) wheel well. I think that is what you are referring to.

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    Re: Intercooler fill level?

    Don't know if this helps at all, but here's a pic of mine.






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    Re: Intercooler fill level?

    ^^^^yup that's it.^^^ Slo-Mo-Shun you have to be looking at the low pressure AC line and filler cap. And don't forget to be parked on level ground cause it looks empty if you are parked nose down and over full if you are nose up.

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    Re: Intercooler fill level?

    Thanks CIWS. That is what I've been talking about. I call it an upside down "T" because to lower half is spliced into a coolant line.

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    Re: Intercooler fill level?

    I fought and fought with this, and now if it's half way up that tube while cold, i consider it good. i was trying to get it to stay all the way to the top, and it's just not happening on mine. halfway when cold, hasn't budged except when hot.

  12. #11
    NORRISK66 is offline Cadillac Owners Member
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    Re: Intercooler fill level?

    maybe i missed something earlier-but why is the intercooler being drained/filled in the first place.

  13. #12
    Guy.Seminerio is online now Cadillac Owners Connoisseur
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    Re: Intercooler fill level?

    Just to clarify, the intercooler fill tank has the following marking going down the side of it:
    ^
    ||
    ||
    Full
    Cold
    ||
    ||
    V

    I looked at the manual and I just want to clarify something. The coolant can show ANYWHERE in that vertical tube when cold and that is ok? What do you guys do? Fill to around the middle?

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    carter's_sts is offline Cadillac Owners Connoisseur
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    I don't think it matters much. I'm happy if it's in the tube.

    When the coolant is changed it seems to take a while to get all the air out and you have to keep adding coolant in small amounts.

    PS this is my 1000th post.

    Seems like maybe a milestone

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    Guy.Seminerio is online now Cadillac Owners Connoisseur
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    Re: Intercooler fill level?

    Congrats! and thanks. I added in the exact manner the manual specifies. After adding, left the cap off and started the car. Let it run for a couple of minutes. Went down but not much. I was pissed because to get it to even show in the vertical portion of the tube I had to add a decent amount. Anyway, just went for a drive and got back. Checked under the hood and coolant wasn't visible. I'll wait until it's cold and check again and add as necessary. Thanks.

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    Quote Originally Posted by carter's_sts View Post
    PS this is my 1000th post.
    Seems like maybe a milestone
    Nice, my 1k and 2k posts whizzed by without notice.

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