Question about 1999 GMC Yukon

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Loosing antifreeze but no leaks - 1999 GMC Yukon

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I would say the intake gasket....I've seen it on two of my own...and my brothers tahoe did the same thing.....look fo leaks on the front and back corners it may be leaking in as well but you would see that in your oil. Take of your oil cap and look for a white froth...if it's there that would be my first bet since these vehicles a famous for going through intake gaskets,

Posted on Jun 09, 2010

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These are common for intake manifold gasket leaks, the coolant gets burned in the motor and sometimes mixes with the oil depending on how bad a leak, have the intake checked for leaks,

Posted on May 14, 2010

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The loss of antifreeze with no apparent leaks could be the sign of many things including blown head gasket, cracked tank, or leaking water pump. I would lean toward a head gasket first. Have you checked the oil for signs of antifreeze? A head gasket won't leak until the system is under pressure and running at normal temperature. You could also have a cracked head although that is pretty rare. Check the oil and plugs for signs of anti freeze. Also check the tanks on the side of the radiator they could be cracked which only leak while under pressure. Check all hose connections and if so equipped tranny cooler lines to make sure they are all attached correctly.

Posted on May 14, 2010

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Posted on Jan 02, 2017

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SOURCE: 3.8 l Olds loosing antifreeze,not leaking and not

anytime you over heat a engine you have caused some sort of damage to the engine weather it be egg shaping the cylinder's or damaging a gasket on the 3.8 it is known to have the seal broken on the intake causing the antifreeze to burn off through the cylinder's job cost is around 700.00 to fix

Posted on Jun 26, 2009

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