Question about 2002 GMC Yukon XL

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2002 yukon car leaks coolant intermittently, generally as engine is cooling or if coolant is added too quickly

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  • cms68 Nov 03, 2008

    Neither I or mechanics can determine. 3 different pressure tests have failed to pinpoint. Antifreeze on garage floor intermittently.

  • yadayada
    yadayada May 11, 2010

    Where does it leak?

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Your description may actually be your answer, so to speak. You mention 'generally as engine is cooling or if coolant is added too quickly'. It sounds to me like the reservoir is over-filled.
When the engine is cooling, coolant tends to flow back to the reservoir (plastic 'jug' where you add coolant). A bad radiator cap or one that was replaced with too low a PSI rating can easily allow too much to fill the reservoir and and occasionally overflow it. Most reservoirs use a rubber tube to drain excess coolant so it may appear to 'leak' near the front left wheel or left side of engine.
Replace your radiator cap. (did they pressure test the cap too?)
Make sure you check your owner's manual for the proper PSI. My sources show 15-16psi, but that sounds a little high to me. Also, make sure you have the correct (50/50) anti-freeze/water mixture.
After you replace the cap, make sure the reservoir has the right amount of coolant and isn't over-filled. (To 'fill cold' line) Drive the engine until hot, then park the truck and see if the problem is fixed. Good Luck!

Posted on Dec 02, 2008

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