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Q: Rear air compressor on 2004 Buick Rainier

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Why would Rear air compressor comes on by it self at times
(1) Answer
Its supposed to, its leveling the car. But, if you come out and rear end is sagging then your bags (shocks attached to compressor are wearing out and letting air from compressor leak out (they would need changing).
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