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Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for scan tool information Circuit/System Verification 1. Engine running, press the A/C request switch. The A/C compressor clutch should engage. 2. Place the mode switch in the defrost position. The A/C compressor clutch should engage. If the clutch does not engage refer to Circuit/System Testing 1. Ignition OFF, disconnect the harness connector at the A/C low pressure switch. 2. Test for less than 5 ohms between the ground circuit terminal B and ground. If greater than the specified range, test the ground circuit for an open/high resistance. 3. Ignition ON, verify the scan tool Low Pressure Switch parameter is Open. If not the specified value, test the signal circuit terminal A for a short to ground. If the 4. Connect a 3-amp fused jumper wire between the signal circuit terminal A and ground. Verify the scan tool Low Pressure Switch parameter is Closed. If not the specified value, test the signal circuit for a short to voltage or an open/high 5. Connect the harness connector at the A/C low pressure switch. Verify the scan tool Low Pressure Switch parameter is Closed. If not the specified value, test or replace the A/C low pressure switch. 6. Ignition OFF, disconnect the A/C relay. 7. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 86 and ground. If the test lamp illuminates, test the control circuit for a short to voltage. 8. Verify that a test lamp illuminates between the ignition circuit terminal 85 and ground.
2008 Chevrolet Silverado 1500 2008 HVAC HVAC - Manual - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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