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Home >> GMC >> 1998 >> Suburban K2500, 6.5 F >> Repair and Diagnosis >> External Pages >> Different car >> Section 71 (Engine Controls - System & Component Testing - 4.3L) >> Miscellaneous Pcm/VCM Controls >> A/C Compressor Clutch Controls >> Compressor Clutch Controls (RWD)

Compressor Clutch Controls (RWD)

WARNING: This page is about a different car, the 1998 GMC Savana, 1998 Chevrolet Chevy Van, and 1998 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

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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