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Q: over heating on 2002 Cadillac DeVille DTS

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
over heats, but it happens qucker when the air conditioner is on.
(2) Answers
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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.