Some Buick Rainier owners report experiencing issues with rear air bag shocks deflating, often due to a faulty air compressor. These problems can occur when the air compressor fails to function correctly, resulting in an inability to properly inflate the air shocks. A common symptom of this issue is the compressor running continuously for an extended period without successfully inflating the air bags. Additionally, some owners find that leaks in the air bags themselves contribute to deflation, particularly at the connection points or from dry rot cracks. To identify these leaks, using soapy water can help reveal escaping air. If the air compressor is confirmed as the source of the problem, replacement may be necessary to restore proper functionality and inflation of the rear air shocks. Addressing these concerns promptly is crucial for maintaining the vehicle's performance.

Owners have reported several instances of the air conditioning not blowing through main dash vents, or only blowing through the floor and defrost vents. Often this is experienced after replacement of the battery. During battery replacement, the control module for the mode actuators may lose its memory. Re-calibration of the actuator is required to address this condition.