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Q: over heating on 2002 Cadillac DeVille DTS

over heats, but it happens qucker when the air conditioner is on.
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It could be many things, hard to comment without being able to do some basic diagnostic tests. Check the coolant level is OK, after that the most likely causes are a cooling system thermostat that is not fully opening, a partially restricted radiator,a mildly blown head gasket or cooling fan that is not operating correctly.
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