Rear air compressor on 2004 Buick Rainier

Why would Rear air compressor comes on by it self at times

by in Potwin, KS on June 30, 2014
1 answer
ANSWER by , August 15, 2014
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).