The water pump and/or the plastic side tanks on the radiator may leak causing a loss of coolant. The engine may overheat due to coolant loss. Continued coolant loss after external leaks have been repaired could indicate a blown head gasket.
Problems for specific Cadillac Seville years:
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Newest reported Cadillac Seville problems
The air conditioning compressor may become noisy or develop a refrigeration leak, requiring replacement.
Fuel injectors can short-circuit electrically causing a rougher than normal idle and reduced performance.