GM Service Manual Online
For 1990-2009 cars only

Handling Air Conditioning (A/C) Compressor for Chevrolet Chevy P12 Chassis 1998

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