Question about 1997 GMC Safari

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I topped up my coolant tank with premixed Prestone (green).

The Prestone label said it was for all vehicles. This was confirmed by my supply store. After a trip of 250 miles, the tank was down some but the color of the fluid was brownish. I'm told that there are different colors of anti freeze but are the specs the same? The Safari's tank was flushed and filled with new coolant (red) a year ago. Since Safari's have problems with head gaskets and heaters, I want to make sure that I'm, using the right coolant. Wayne

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Wayne, GM started using Dex-Cool coolant in '96 (u call it red, I call it orange), @that time that was all u could (or should) have used in GM vehicles, my manual even says 'do not mix dex-cool with any other type antifreeze.' But since then, Prestone has come out w/ a formulation for ALL vehicles, and I checked their website, and it states that this new formulation is compatible with all others, regardless of color. So u are ok with topping off w/ the new stuff. Going back to my early school days , I believe orange(red) and green=brown? So, it may not look nice, but your brown coolant is ok. Curt

Posted on Nov 19, 2008


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If this helps please rate me!
You can do it.

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