GM Service Manual Online
For 1990-2009 cars only

HVAC Compressor Controls System Check for Buick Century (China) 2000

These diagnostics are included with Engine Controls for HVAC Compressor Controls System Diagnosis and Circuit Operation. Refer to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls - 2.5L (LB8) and 3.0L (L46).