Generally, you should have about a 50/50 (%) mixed of antifreeze and distilled water. GM recommends using Dexcool antifreeze.
I would recommend that you use whatever antifreeze that is in there now and stick with the 50/50 mix.
Take Care,
Greg
Also take care that if your van came with Dexcool (red in color) DO NOT add normal anti-freeze (green) to it. The Dexcool is lifetime antifreeze, and it will GEL if you add normall to it and bye bye engine. If it's red top up with Dexcool, or flush and refill with normal. Regards Brash911
Dexcool.
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Very Carefully
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You did not say what you are adjusting.