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Home >> GMC >> 1998 >> C3500 HD 6.5 F, Standard >> 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 Trucks)

Compressor Clutch Controls (RWD Trucks)

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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