Question about 2003 GMC Yukon XL

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I am leaking aintfreez i put a ole bottle of

I am leaking aintfreez i put a hole bottle of aintefreez last night and this afternoon it is low and the aintfreez is getting hot

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Do you see fluid leaking anywhere?if not then you have an internal leak. check oil dip stick, pull it out and look to see if its a milky color or you could take off the oil fill cap and it will looks similar and have a build up of goo on the inside of the cap. Another sure fire way is to hold a piece of card board up to your exhaust and see if it collects water condensation on it. Some time though its obvious and water will be puddling near the pipe with a larger than normal vapor cloud. One more way to tell is to wait till car has cooled then top off with water, now dont add anymore coolant because you'd just be wasting it anyway and start the car and watch with the cap off and if you start to see a lot off bubbles forming then you know you got either a cracked head or a blown head gasket. but if your lucky it might be that your thermostat it stuck closed and this is prematurely boiling off the coolant...and make sure that you see the radiator fan come on, this to will cause overheating. Now to protect the engine from overheating while doing all these test, have the heater running anytime you see it overheat, this will dump the cooler water from the heater lines into the engine and bring it down a couple notches. while the engine is hot and running you've got to inspect all your hoses or at least get your car pressure checked, they will pump it up to about 16psi and it should hold for at least a good ten minutes if it start to drop in pressure then you have an internal leak.
but if the coolant is just boiling over you could have a bad radiator cap waterpump, or thermostat...and heres a quick way to tell if the system is operating normally. top of radiator again if needs it with water, install cap, start car and put your hand over the upper radiator hose...you shouldnt feel any water or pressure going through the hose.. but when it reaches normal operating temp and hopefully you also hear your fan come on, put your hand on the hose again..now it should be hot and give it a squeeze and let go..you should feel a slight back pressure this will mean the pump and thermostat is working. Now look in the overflow bottle is it starting to overfil rapidly? if not then you radiator cap is working also..but if you see small bubbles coming up out of the overflow tank this means exhaust gases are leaking into the coolant system. You can go to a shop and have a "Block Check" done it consist of a blue dye and a sample of your coolant is mixed with this.. if it turns green then you know positively that you have a blown gasket. i hope you dont because these repair cost quite a bit. good luck i hope its just boiling over.

Posted on May 03, 2010

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