Question about 2007 Hummer H3X

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2007 Hummer H3T...I noticed a small puddle under my Hummer. After looking under the hood, I noticed that anti-freeze had been spread, or blown all over the underside of the hood and on the engine. With it hot, I couldn't see any signs of a leak. It was mostly visible around the radiator. Ever heard of a similar problem?

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Yes, You have a hairline crack on your radiator which needs to be replaced,, H3 radiator tank are plastic and somewhere after 75 to 80 thou miles they start to leak.. autopartswarehouse.com has the radiator for $129.00, find someone to get it install for you,, very easy task,, dealer will kill you with over a $500 charge.

Posted on Mar 25, 2013

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Pretty likely you have a pin hole leak in the radiator core or in a nearby hose. Air flow from driving or form the fan blowing will spread the coolant all over under the hood. Best way to find its source is by pressure testing the system with the engine off so nothing blows around. Sometimes you can do the same thing by running it up to operating temp, shutting it off and letting it sit a minute or two so pressure increases. Sometimes, depending on where the leak is, you won't be able to see it but will see the coolant escaping. If you see coolant coming out anywhere in the area of the radiator, there is nothing else there that can be leaking....therefore it's a safe bet that your leak is in the radiator. In that case, remove it and have a radiator shop look at it and advise you on the best repair options.

Posted on Sep 29, 2010

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