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Re: disappearing coolant
I have the same problem in my 2000 yukon xl 5.3 currently 110k miles.
I've taken it to the dealer multiple times and they cannot figure it out.
They did the dye test and the pressure test.
Its been going on for about a year now.
Also just experienced a sudden drop oil pressure from about 40 to about 20.
I'm thinking I've got a leaking gasket somewhere.
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