A/C Control Module (ACM)

When A/C function is selected, the ACM sends a request signal to the SBEC approximately .5 second before A/C clutch is energized. The SBEC increases engine idle speed to compensate for increased engine load. Approximately .5 second before ACM de-energizes A/C compressor clutch, the ACM stops sending request signal and SBEC reduces idle speed to compensate for decrease in engine load.