how do i determine if an internal coolant leak is the falt of a bad intake gasket on 2003 GMC Yukon

or a blown head gasket

Asked by for the 2003 GMC Yukon
do a chemical test on cooling system. do you have water in oil or oil in water?have you ever overheated vehicle?
2 more answers , 1 more comment
I live in Ft. Myers. Contact me buy email if you want help.
If you have the 4.8/5.3/6.0 engine, then its most certainly NOT the intake gasket, because these engines use a "dry" intake (no coolant goes through the intake).

If your getting coolant in the oil, then you may have a bad oil cooler (if equipped) or a bad cylinder head (common with these cylinder heads). To verify if its the head, fill the cooling system full (no air pockets) and then pressurize the cooling system. Remove the valve covers (both) and let sit for 5 minutes. Then inspect around the middle row of head bolts (between the rockers). if you see coolant puddle on top of the standing oil, the heads are porous.
i have antifreeze leaking soon i put in in tha morning, i can see it comming from the bottom, and its also sweaks in the morning but stops after i drive for awhile
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