ccr system on 1991 Cadillac Seville

what is the ccr system in this car

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3 answers
no Im reffering to the rear suspension comand control ride system,It is not working anymore. I am trying to determine if I can track down the problem myself, and how do you check to see if it is the compressor or electrical or not.
What are you referring to? Is it related to the A/C? Did someone recommend a certain repair?
not sure can u tell me