location of second rubber cap plug in radiator. (not the drain plug)
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2008-2013 Cadillac CTS General Discussion Discussion, location of second rubber cap plug in radiator. (not the drain plug) in Cadillac CTS Second Generation Forum - 2008-2013; My 2009 CTS sprang a major leak in a rubber cap plug located on the top right inside of the ...
  1. #1
    salty joe is offline Cadillac Owners Member
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    location of second rubber cap plug in radiator. (not the drain plug)

    My 2009 CTS sprang a major leak in a rubber cap plug located on the top right inside of the radiator. It was easy to fix but I can't find the second cap. It must be ready to fail. Anybody willing to share the location of the second cap would be much appreciated.
    Luckily, my wife pays attention to things like the temp gauge.

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    AAIIIC's Avatar
    AAIIIC is offline Super Moderator
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    Re: location of second rubber cap plug in radiator. (not the drain plug)

    What rubber cap are you referring to (I've never heard of a rubber cap on a radiator), and why do you think there's a second that's about to fail?
    '05 Stealth Grey CTS-V, 19x8.5/10" CCW T140s with Toyo Proxes T1 Sports (summer), black Team Dynamics ProRace 1.2 wheels with 275/35-18 R-compounds (track), Hyperblack Rota Torques (winter), KW Variant3s, V2 front brakes, Hotchkis rear sway bar, EPS cam, TEA-ported 243 heads, FAST92 intake w/LS2 TB, JBA Camaro/G8 1-3/4" shorty headers w/JBA cat pipes, Corsa exhaust, UUC motor and tranny mounts, UUC shifter, MAPerformance trailing arms, Specter cradle bushings, etc...

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    Long's Avatar
    Long is offline Cadillac Owners Master
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    Re: location of second rubber cap plug in radiator. (not the drain plug)

    You asked the questions that the rest of us have been pondering.
    silversport likes this.

  5. #4
    HurstGN's Avatar
    HurstGN is offline Cadillac Owners Connoisseur
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    Re: location of second rubber cap plug in radiator. (not the drain plug)

    Might be an aftermarket rad with aux cooling that isn't used and the aux cooling had rubber caps on it when installed?

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    AAIIIC's Avatar
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    Re: location of second rubber cap plug in radiator. (not the drain plug)

    Maybe salty joe can provide a picture of the first rubber cap so we can figure out what he's talking about.

  7. #6
    salty joe is offline Cadillac Owners Member
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    Re: location of second rubber cap plug in radiator. (not the drain plug)

    I took a picture and even though I set the camera file size at small, it's too big for this site. I don't know how to make it smaller.
    Anyway, the plug is a 3/4" rubber cap that fits over a 3/4" tube. I think there must be another one because it must either be an inlet or an outlet-I can't imagine openings in a radiator not coming in pairs.
    Good call on an after market radiator. I know this car took a hit on the front before bought it.
    Thanks for the responses, I appreciate it.

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it.
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    Re: location of second rubber cap plug in radiator. (not the drain plug)

    Download the picture to a computer picture file folder. Open it using something like Windows Paint, resize it to less than 800 X 800. Use this site Advanced, Manage Attachments window, upload the picture.

    Please update your profile to show car(s) driven, approximate location, time zone, other info. It sure makes advice and diagnosis easier when the members can see at a glance what they're working on.

    Which engine, cooling system, which radiator ?

    https://www.rockauto.com/en/catalog/...,radiator,2172

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