Air Conditioning (A/C) Request Circuit Diagnosis. GMC Truck GMC C-Series Medium Duty Truck B7 1998

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 1998 🢒 GMC C-Series Medium Duty Truck B7 🢒 Engine 🢒 Engine Controls - 6.5L (L65) 🢒 Air Conditioning (A/C) Request Circuit Diagnosis

Refer to Engine Controls Schematics

A/C Controls

Engine Controls Components
Information Sensors
4L80-E Switch and ISS Controls
.

Circuit Description

Turning ON the air conditioning supplies ignition voltage to the A/C compressor clutch and to the PCM to increase and maintain idle speed.

The PCM does not control the A/C compressor clutch. Therefore, if the A/C system does not function, refer to A/C Systems of the appropriate service manual for diagnosis of the system.