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2 3. Start the engine. 4. Allow the engine idle at normal operating temperature. 5. Select the maximum blower speed. 6. Select the PANEL air outlet mode. 7. Select the coldest temperature setting. 8. Cycle through all of the blower speeds, modes and temperatures to define what Musty smell Coolant smell Oil smell Does the odor have a musty smell? Go to Step 3 Go to Step 8 3 Inspect the HVAC air inlet grille for debris. Go to Step 4 Go to Step 5 4 Remove any debris. Go to Step 15 - 5 Inspect for wet carpeting. Go to Step 6 Go to Step 14 6 Inspect for the following conditions: Water leaks around the windshield Blockage of the HVAC module drain Leaks around the door seals Go to Step 7 Go to Step 14 7 Repair the leak as necessary. Go to Step 15 - 8 Does the odor have a coolant smell? Go to Step 9 Go to Step 12 9 Inspect the cooling system for leaks. Refer to Go to Step 10 Go to Step 12 10 Inspect for coolant leaking inside the vehicle or
2008 Chevrolet Silverado 1500 2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
REPAIR INSTRUCTIONS ODOR CORRECTION Eliminating Air Conditioning Odor Odors may be emitted from the air conditioning system primarily at start up in hot, humid Debris is present in the HVAC module. Microbial growth on the evaporator core When the blower motor fan is turned on, the microbial growth may release an unpleasant musty Deodorize the evaporator core using Deodorizing Aerosol Kit. Is the condition present? Go to Step 11 Go to Step 15 11 Replace the heater core. Refer to Heater Core Go to Step 15 - 12 Does the odor have an oily smell? Go to Step 13 Go to Step 15 13 1. Inspect the engine compartment for any leaks. Refer to the following procedures: Oil Leak Diagnosis Fluid Leak Diagnosis Power Steering Fluid Leaks 2. Repair any oil leaks. Is the repair complete? Go to Step 15 - 14 A musty odor can be caused by mold or mildew Go to Step 15 - 15 Operate the system in order to verify the repair. System OK Go to Step 2
2008 Chevrolet Silverado 1500 2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Perform the following steps in order to deodorize the A/C system: 1. Ensure that the plenum which draws outside air into the HVAC module is clear of debris. 2. Disable the A/C compressor clutch operation by disconnecting the clutch coil electrical connector. 3. Dry the evaporator core by performing the following steps: 1. Start the engine. 2. Select the warmest temperature setting. 3. Select the recirculation mode. 4. Run the blower motor on high for 10 minutes. 4. Locate an area in the air conditioning duct between the blower motor and the evaporator core downstream of the blower motor. 5. Drill a 3.175 mm (0.125 in) hole where the hole will not interfere with or damage the following components: The blower motor The evaporator core Any other operating part the of system 6. Wear safety goggles and latex gloves in order to perform the following actions: 1. Select the maximum blower speed. 2. Insert the deodorizer extension tube into the hole to the mark on the extension tube. 3. Use short spray bursts and vary the direction of spray for a 2-3 minute period of time. 7. Shut the engine OFF. Allow the vehicle to sit for 3-5 minutes. 8. Seal the 3.175 mm (0.125 in) hole with body sealer or RTV gasket compound. 9. Start the engine. 10. Operate the blower motor on high for 15-20 minutes to dry. 11. Reconnect the A/C compressor clutch coil electrical connector. 12. Verify proper clutch operation. REFRIGERANT RECOVERY AND RECHARGING Tools Required J 43600 ACR 2000 Air Conditioning Service Center. See Special Tools. J 45037 A/C Oil Injector. See Special Tools. Recovery and Recharge
2008 Chevrolet Silverado 1500 2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
The J 43600 is a complete air conditioning service center for R-134a. See Special Tools. The CAUTION: Avoid breathing the A/C Refrigerant 134a (R-134a) and the lubricant vapor or the mist. Exposure may irritate the eyes, CAUTION: For personal protection, goggles and gloves should be worn and a clean cloth wrapped around fittings, valves, and NOTE: R-134a is the only approved refrigerant for use in this vehicle. The NOTE: To avoid system damage use only R-134a dedicated tools when NOTE: Use only Polyalkylene Glycol Synthetic Refrigerant Oil (PAG) for NOTE: R-12 refrigerant and R-134a refrigerant must never be mixed, even
2008 Chevrolet Silverado 1500 2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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