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temperature? Go to Step 10 Go to Step 8 4 1. Select the minimum blower speed. 2. Select the warmest temperature setting. 3. Feel the temperature of the inlet and outlet hoses at the heater core. Does the inlet heater hose feel warmer than the CAUTION: Refer to Moving Parts and Hot Surfaces Go to Step 11 Go to Step 5 5 Test the operation of the A/C compressor Go to Step 7 Go to Step 6 6 Repair the A/C compressor clutch. Refer to Air Go to Step 14 - 7 Perform the A/C system performance test. Refer Air Conditioning (A/C) System Performance
or Air Conditioning (A/C) System Go to Step 9 Go to Step 12 8 Repair the low engine temperature concern. Go to Step 14 - 9 Inspect for correct operation of the recirculation Go to Step 14 Go to Step 13
2008 Chevrolet Silverado 1500 2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
NOISE DIAGNOSIS - BLOWER MOTOR 10 Repair the air delivery concern. Refer to Go to Step 14 - 11 Repair the heating concern. Refer to Heating Go to Step 14 - 12 Repair the A/C performance concern. Refer to Go to Step 14 - 13 Repair the recirculation door concern. Refer to Go to Step 14 - 14 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 Inspect the air inlet grille for debris. Go to Step 8 Go to Step 3 1. Sit inside the vehicle.
2008 Chevrolet Silverado 1500 2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
3 2. Close the vehicle doors and windows. 3. Turn ON the ignition, with the engine OFF. 4. Cycle the blower motor through all of the speeds and modes in order to determine Is a noise evident during the blower operation? Go to Step 4 Go to Step 11 4 Inspect for excessive vibration at each blower Go to Step 6 Go to Step 5 5 Listen to the blower motor at each speed. Go to Step 9 Go to Step 11 6 1. Remove the blower motor. Refer to Blower Motor Replacement. 2. Inspect the blower motor impeller for deposits of foreign material. 3. Inspect the blower motor for deposits of foreign material. Did you find any foreign material on the blower Go to Step 8 Go to Step 7 7 Inspect the blower motor for the following Cracked blades A loose impeller retainer Improper impeller alignment Go to Step 9 Go to Step 10 8 Remove the foreign material. Go to Step 10 - 9 Replace the blower motor. Refer to Blower Go to Step 11 -
2008 Chevrolet Silverado 1500 2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
NOISE DIAGNOSIS - AIR CONDITIONING (A/C) SYSTEM 10 Install the blower motor. Refer to Blower Go to Step 11 - 11 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. A/C system noises can be generally categorized into 3 areas: Screeching, squealing, chirping noises Moaning noises Vibration/rattle noises 2. Start the engine. 3. Ensure that the A/C is ON. Is a screeching, squealing noise heard when the Go to Step 3 Go to Step 9 3 With the engine OFF, inspect the drive belt for Go to Step 18 Go to Step 4 4 Inspect the drive belt tension. Refer to Drive Go to Step 19 Go to Step 5 5 Inspect the drive belt for excessive oil coverage. Go to Step 17 Go to Step 6
2008 Chevrolet Silverado 1500 2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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