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Workin on a friends 98 blazer, need to change the rad due to a leak. I noticed that there is green coolant instead of the reccommended GM dexcool fluid.

I would rather not flush the whole system during the rad swap, so should i continue using green stuff or just mix in some Dexcool?

Thanks for your input!!

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Do not ever mix the red and green antifreezes together in the same system is what I have been told Those that have mixed them had to drain, flush and replace the mix with red stuff only or maybe green stuff only do to overheating issues with the mix