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What happens if I have two different kinds of antifreeze coolant in my Cadillac Catera?

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    What are the 2 coolants in your radiator? – tlhIngan Jun 11 '17 at 21:36
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    Can you clarify, did you mean "kinds" (as in difference chemical makeup) or did you mean "brands" (Prestone vs Peak)? – CharlieRB Jun 12 '17 at 13:29
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If the coolants are compatible, they will mix and there shouldn't be any problems. However, if the two coolants are not compatible with each other, you will likely get nasty deposits. If there's enough of them, it may cause an obstruction and your engine will overheat.

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