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98 Civic Ex
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244 Posts
Discussion Starter #1
With the rad over flow can it take the fluid back in if it needs it?
I know its a stupid question but I just need it to be cleared up between a friend and i
 

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68 Camaro
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4,583 Posts
coolant gets hot, it expands, it expands into the overflow tank



when it cools back down it creates a vacuum which pulls the coolant out of the bottle back into the rad.
 
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