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Home >> GMC >> 1998 >> Forward Control 6.5 F >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Controls - System & Component Testing - 7.4L) >> Miscellaneous Pcm/VCM Controls >> A/C Compressor Clutch Controls >> Compressor Clutch Controls (RWD Vans)

Compressor Clutch Controls (RWD Vans)

WARNING: This page is about a different variant/trim than selected.

The A/C clutch relay is controlled by PCM. The PCM improves idle quality by delaying compressor clutch engagement until idle speed is increased, or disengages compressor clutch when idle speed is too low. Compressor clutch is cycled by PCM. The PCM smooths cycling of compressor clutch by adding fuel the instant compressor clutch is applied.

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