Question about 1999 GMC Yukon

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Radiator leak small leak, 1-2 years ago and did the stop leak thing - no problem, 1 mo. ago changed oil, they added a qt of antifreeze as usual......2 days ago radiator was dangerously low - no obvious leaking onto garage floor. no obvious oil colors to indicate engine

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  • Steven Brock May 11, 2010

    is there white smoke from your exhaust? Not only during cold mornings but in the afternoon too...

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It could aslo be the exausht manifold leak i just last month had to have that fixed. run your car for some time then stop and check underneath see if it is leaking towards back end of engine or if you can hear a hissing sound fron middle top of engine

Posted on Nov 19, 2008

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3 Answers

I have a slight amount of oil in my radiator, I had this years ago and my dealer fixed it and said it was something small. Anyone know what it maybe or had the same experience. Thanks


This is a concern that requires immediate attention. Oil in the coolant or coolant in the oil is an indication that the integrity of the engine has been compromised and a passage has developed between the oil and coolant.

Installed in some radiators is a transmission coil cooler that is connected usually at the bottom of the radiator by two metal tubes. A failure internally of the radiator could breach the separation.

Head gaskets that have coolant pass through openings can also be a failure allowing the liquids to mix.

Look for coolant in the engine oil.
Check for oil level overfull

Look for steam from exhaust

Hope this helps.

Have repair done ASAP at qualified shop
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Oil in water
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Head Gasket Failure
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1 Answer

Car overheats


There could be many causes for a small leak, including foreign debris, small crack or loose hose. Using just water with no antifreeze can damage your radiator in sub 32 temps so always mix with coolant/antifreeze. One temp solution is buying stop leak from a auto part store, another remedy I've heard work is putting black pepper (finely ground) in your system to stop small leaks and it actually works. Good luck.

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If coolant was getting into oil at the rate you say, it's a miracle you haven't spun a bearing by now!!!!
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