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Re: 99 gtp radiator won't drain
Good point lefty!
Dex-cool (aka dexcrap) IMO does just fine. I have left it in all my GM cars and the only cooling system issues I have had is LIM gasket leaks (due to faulty design). See my recent post.
If you do switch over, like Jerad said, make sure and thourougly flush all the old dex-cool out or they two can react and sludge up.
Also, I usually mix dex-cool 50/50 with a gallon of distilled water instead of regular tap water. (just what I do)
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-2000 Grand Prix GTP 170,000mi (daily driver)
-2000 Olds Alero 100,000mi (soon to be DD with gas at $3.45/gal)
-1997 Chev K1500 4x4 115,000mi (Natalie's truck [nans_grandprix])
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