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Q:

why does the check eng. light stays on all of the time on 2000 Cadillac DeVille

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
does it have anything to do with losing coolage
(1) Answer
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You need to have your check engine light codes read to see what systems have a fault. If you are also loosing coolant, you could be at serious risk of damaging your engine. Once the technician knows what system has a fault, they can determine the exact cause and recommend a repair.
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