GM Service Manual Online
For 1990-2009 cars only
  1. Run the engine at 1250 rpm.
  2. Note the compressor buildup time.
  3. Compressor buildup time from 586-689 kPa (85-100 psi) should be 15 seconds.

  4. Check for air leaks in the system if the air pressure does not build within the specified time. Refer to Air Leakage Check for information on checking the air lines and overall system leakage.