The air conditioning compressor may become noisy or develop a refrigeration leak, requiring replacement.
Problems for specific Cadillac DeVille years:
Car problem reports
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Most reported 1997 Cadillac DeVille problems
One or both transmission output shaft seals may leak. Our technicians tell us that worn bushings inside the transmission could be the cause of the damaged seals. Our technicians tell us that if a bushing is worn, excess play will be noted where the drive axle attaches to the transmission.
The high-pressure power steering lines are known to leak.
An intake manifold vacuum leak can develop from a variety of sources, often causing illumination of the Check Engine Light with codes P0171 & P0174 stored. Thorough diagnoses will be necessary to pinpoint the cause in order to make the correct repairs. A "smoke" machine is often used to isolate the cause of difficult to find vacuum leaks.
Illumination of the Check Engine Light may be the result of a loose or worn gas cap.