GM Service Manual Online
For 1990-2009 cars only

Handling Air Conditioning (A/C) Compressor for Chevrolet Chevy P42 Commercial Chassis 1997

Do not strike, drop, or turn the compressor upside down. If the compressor is knocked over or turned upside down, rotate the compressor's magnetic clutch 5-6 times by hand to circulate the oil which has settled in the cylinder. Sudden rotating with oil in the cylinder can cause valve damage and adversely affect durability.