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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 4 (Engine Controls - System/Component Tests) >> Idle Air Control - Vehicles Without 4L80-E Transmission >> Idle Air Control System Check Chart >> A/C Compressor Or Relay Failure

A/C Compressor Or Relay Failure

WARNING: This page does not describe the selected car, but rather 35 other vehicles, including the 1992 Pontiac Trans Sport, 1992 Oldsmobile Silhouette, 1992 Oldsmobile Bravada, 1992 GMC Yukon, and 1992 GMC Vandura Special. However, it is still accessible from the selected car via links, so may be relevant.

Refer to A/C diagnosis if circuit is shorted to ground. If the relay is faulty, idle problem may exist. Refer to BASIC TESTING article in this section section.

NOTE: If intermittent poor drivability or idle symptoms are resolved by disconnecting the IAC, carefully recheck connections, valve terminal resistance or replace IAC.
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