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Coolant for 2001 PT Cruiser: anitfreeze type or water only for South Florida?

I am in disagreement with my husband on the proper coolant for my PT Cruiser. I am of the opinion that we should be using antifreeze. My husband says that plain water is just as good since we live in Cape Coral, Florida and do not have to worry about freezing temperatures. He claims that the antifreeze makers are just trying to make a buck on us Southern Floridians. Who's right?


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