How much 50/50 coolant would I need for refilling the radiator on a 97 pontiac...

KORG

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...sunfire? I have 4 gallons of the dex cool 50/50. I'm going to flush out the old stuff and refill it with the new. I'm just hoping 4 gallons will be enough. Thanks.
 
get 2 gallons to be safe. The radiator should hold about a gallon. When the system bleeds out air it will take more but it shouldn't be over a total of 2 gallons.
 
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