Question about 2002 GMC Yukon Denali

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2002 GMC YUKON COOLANT KEEPS EVAPORATING

MY COOLANT KEEPS EVAPORATING AND TEMP NEEDLE GOES ALL THE WAY UP. I HAVE FLUSHED THE RADIATOR AND CHANGED THE THERMOSTAT.I DONT KNOW WHAT MY NEXT MOVE SHOULD BE. WHAT DO YOU THINK. SOMEONE TOLD IT COULD BE DEHIDRATION AND MY HEAD GASKET MIGHT BE BAD.

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  • rrueppel Jul 29, 2008

    Had the same/similar problem. Was losing coolant but did not see a leak anywhere. Took to the dealership and was told that i needed to replace the water pump.(they said it was a very small leak). Since I was going on a long trip in 3 days, I took to a friend of mine that owns a tire dealership but has been working on cars all his life (I didn't even see moisture on the water pump). He put a device on the overflow tank and pumped up the coolant system to about 15 psi. We both saw the problem immediately. The overflow tank is a two piece plastic tank. Under pressure (when vehicle hot) it would leak out of the tank between the seems. Replace tank for $50 and that was that. The dealership wanted to charge $450 to replace water pump and still wouldn't have taken care of the problem. Watch the dealerships!!

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If you dont see antifreeze leaking anywhere,its the head gasket,check your oil dipstck,the antifreeze is probally mixxing with the oil as it leaks thru the gasket and will give the oil a milky white color on the dipstick,if you start to see white smoke from the exaust then its leaking into your exaust port,either way head gasket and change as soon as possible,you dont want it in the oil cause you can seize the motor

Posted on Jul 08, 2008

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Sounds like a head gasket to me. Turn the engine on and put your hand near the exhaust and see if you feel any moisture. If you feel or see vapor it's more than likely the head gasket. Although it could be the intake gasket as well. Either way you're looking at a lot of work.

Posted on Jul 08, 2008

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My 2005 Denali is losing raidtor fluid dont see where it is leaking and somtimes I can see steam coming from under the hood on the passenger side close to the windshield

Posted on Feb 10, 2010

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I have 2003 Yukon XL and I am losing antifreeze. Ilooked under hood and it looks like gasket to water pump is leaking. Do those over the counter stop leak liquids work.

Posted on Dec 14, 2008

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