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Radiator issues

This is a discussion on Radiator issues within the GTO forums, part of the Vehicle Specific category; I've started to notice coolant spraying from the filler cap when driving before the engine is fully warmed to op ...

  1. #1
    Insurgent Hunter dethinboots's Avatar
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    Impulse Blue
    2005 a4 GTO

    Radiator issues

    I've started to notice coolant spraying from the filler cap when driving before the engine is fully warmed to op temp or for extended driving periods. I drained and refilled the radiator less than 1k miles ago. Is it just really filthy?

  2. #2
    Former Mopar Man 2002ssslp's Avatar
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    Silver & Blue
    02 Camaro SS, 04 GTO

    You may have a bad cap, a cracked radiator, a bad connection for the overflow tube or a bad radiator. Put a pressure tester on it and find out where the leak is coming from.
    My ride is a 2002 Camaro SS SLP #3296 with 30k, LTH, 3" Y, CME, Frost tune, K&N, ported TB, Blackwing lid, Bellows, MSD, Denso Iridium, and 85mm MAF, Bilsteins, Eibach springs, SLP strut brace, Adj. Panhard, TA Girdle, UMI, Pro 5.0, Nitto NT555
    My wife has a 2004 GTO with the rare SAP, 18" wheels, K&N Cold Air System, MSD, Ported TB, Frost tune, Denso Iridium, Flowmaster cat-back, 3200 Yank, 75k

  3. #3
    Sold: LS1 '85 El Camino ls1camino's Avatar
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    2000 Grand Prix GTP
    2000 Trans Am WS6 M6

    Caps go bad. Replace it and see what happens.

  4. #4
    Insurgent Hunter dethinboots's Avatar
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    I'm definitely going to start with the cap. Is there more pressure in that system when cold? I know that's a dumb question but why else would it be doing it when cold?

  5. #5
    Smiles for 9.5 Years cammed goat's Avatar
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    Phantom Black Metallic
    2004 GTO M6

    Start with the cap. When mine went bad, the coolant would leak past the cap and onto the ground. I changed the cap and it was faulty. Changed it again, third time was a charm. Get back to us with what you find.

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