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6 1. Start the engine. 2. Ensure that the A/C is ON. 3. Inspect the compressor and the clutch. Is the compressor locked up? Go to Step 24 Go to Step 7 7 Is the A/C compressor clutch slipping? Go to Step 23 Go to Step 8 8 Using a stethoscope, listen to the A/C Go to Step 15 Go to Step 10 9 Does a moaning noise exist when the A/C clutch Go to Step 10 Go to Step 12 10 Listen to the A/C compressor components and Go to Step 20 Go to Step 11 11 1. Idle the engine. 2. Engage the A/C compressor clutch. 3. Using a stethoscope, move around the entire refrigerant plumbing system, Are any of the A/C components grounding out Go to Step 22 Go to Step 13 12 Does a vibration or rattle noise exist when the Go to Step 13 Go to Step 14 13 Does the noise stop when the A/C clutch is Go to Step 15 Go to Step 14 14 1. Idle the engine in PARK with the A/C compressor clutch engaged. 2. Using a stethoscope, move around the entire A/C system testing for any abnormal Do any of the A/C components cause an Go to Step 21 Go to Step 25 Verify that the A/C system is properly charged.
2008 Chevrolet Silverado 1500 2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
15 Refer to Refrigerant System Capacities. Go to Step 26 Go to Step 16 16 Recharge the A/C system to specification. Refer Go to Step 25 Go to Step 26 17 Repair the oil leak. Refer to the appropriate Go to Step 26 - 18 Replace the A/C drive belt. Refer to Air Go to Step 26 - 19 Replace the A/C drive belt tensioner. Refer to Go to Step 26 - 20 Repair or replace the A/C compressor mounting Go to Step 26 - 21 Repair or replace the component which is Go to Step 26 - 22 Correctly route or insulate the A/C component. Go to Step 26 - 23 Replace the A/C compressor clutch. Refer to Go to Step 26 - 24 Replace the A/C compressor. Refer to Air Air Conditioning Compressor Replacement or Air Conditioning Compressor Replacement (LU3). Go to Step 26 - The concern may be caused by an engine related
2008 Chevrolet Silverado 1500 2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
NOISE DIAGNOSIS - HVAC MODULE 25 component. Refer to Vibration Analysis - Go to Step 26 - 26 Operate the system in order to verify the repair. System OK Go to Step 2 Step Action Yes No 1 Were you sent here from Symptoms or another Go to Step 2 Go to Symptoms 2 1. Start the engine. 2. Cycle through all of the following: Blower motor speeds HVAC modes Temperature control settings 3. Determine the type of noise: Scrape, pop Tick/click, chirp or groaning Air rush/whistle Is a scrape or pop noise evident when selecting Go to Step 6 Go to Step 3 3 Is a tick/click, chirping, groaning or scraping Go to Step 6 Go to Step 4 4 Is an air rush/whistle noise evident in all modes Go to Step 6 Go to Step 5 5 Is an air rush/whistle noise evident only in Go to Step 6 Go to Step 6
2008 Chevrolet Silverado 1500 2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
ODOR DIAGNOSIS 6 Remove the instrument panel I/P carrier. Refer Go to Step 7 - 7 1. Inspect the air flow doors for proper operation. 2. Inspect the ducts for obstructions or foreign materials. Were any of these conditions found? Go to Step 10 Go to Step 8 8 Inspect the mode and temperature doors and Go to Step 11 Go to Step 9 9 Replace the appropriate door and/or seals. Go to Step 11 - 10 Remove any obstructions or foreign material Go to Step 11 - 11 Install the I/P carrier. Refer to Instrument Go to Step 12 - 12 Operate the system to verify the repair. System OK Go to Step 2 Step Action Yes No 1 Were you sent here from Symptoms or another Go to Step 2 Go to Symptoms 1. Sit inside the vehicle. 2. Close all of the doors and windows.
2008 Chevrolet Silverado 1500 2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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