There are two checks for your coolant, one is strength which tells you what temperature it is good too and the second most important is a Ph level test, which tells you how acidic your coolant is. Both can be tested quickly at the dealer or by yourself if you buy the tester and Ph strips.
As for type of coolant, read the reservoir cap, or owner's manual, it will tell you if you use FL22 or not. My '05 doesn't, so I just buy Prestone Longlife coolant.
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