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REFRIGERANT SYSTEM CAPACITIES Compressor Suction Hose to Accumulator 41 N.m 30 lb ft Condenser Upper Insulator Retainer Bolts 2.4 N.m 21 lb in Discharge Hose Mounting Bolt (LR4, LM7, LQ4 16 N.m 12 lb ft Evaporator Tube Fitting at Orifice 25 N.m 18 lb ft Evaporator Tube Nut at Condenser 16 N.m 12 lb ft Evaporator Tube Nut at Evaporator 16 N.m 12 lb ft Evaporator Tube to the Auxiliary A/C Tube 16 N.m 12 lb ft Filter Access Door Screw 1.6 N.m 14 lb in Floor Air Outlet Duct Screw 1.6 N.m 14 lb in Heater A/C Auxiliary Tubes Retaining Nuts 7 N.m 62 lb in Heater Core Cover Screws 1.6 N.m 14 lb in Heater Hose Outlet Mounting Nut and Bolt 25 N.m 18 lb ft Heater/Ventilation Module Mounting Nuts 9 N.m 80 lb in Heater/Ventilation Module Mounting Screws 4 N.m 35 lb in Heater Ventilation Module Screws 1.6 N.m 14 lb in Insulator Retainers and Bolts 2.4 N.m 21 lb in Pressure Relief Valve 9 N.m 80 lb in Suction Hose Mounting Bolt (LR4, LM7, LQ4 16 N.m 12 lb ft Application Specification Metric English PAG Oil GM P/N 12378526 for United States 60 ml* 2 oz* * Add PAG oil equal to the amount of oil drained from the accumulator plus the Compressor Replacement 60 ml 1
2 oz 1
The Denso service compressor is precharged with 237 ml (8.0 oz) of PAG oil. Condenser Replacement 30 ml 1
1 oz 1
Evaporator Replacement 90 ml 1
3 oz 1
2008 Chevrolet Silverado 1500 2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
DIAGNOSTIC INFORMATION AND PROCEDURES DIAGNOSTIC STARTING POINT - HEATING, VENTILATION AND AIR CONDITIONING Begin the system diagnosis with Diagnostic System Check - Vehicle . The Diagnostic System The identification of the control modules which are not communicating. The identification of any stored diagnostic trouble codes (DTCs) and their status. The use of the Diagnostic System Check - Vehicle will identify the correct procedures to begin LEAK TESTING Tools Required J 39400-A Halogen Leak Detector. See Special Tools. J 41447 R-134A A/C Tracer Dye-Box of 24. See Special Tools. J 42220 Universal 12V Leak Detection Lamp. See Special Tools. J 43872 Fluorescent Dye Cleaner. See Special Tools. J 46297 A/C Dye Injector Kit. See Special Tools. J 46297-12 Replacement Dye Cartridges. See Special Tools. Evaporator, Rear Replacement 90 ml 1
3 oz 1
Total System PAG Oil Capacity 210 ml 7.1 oz Total System PAG Oil Capacity with Rear 330 ml 11 oz R-134a Refrigerant Charge 0.7 kg 1.6 lb Refrigerant Charge Utility with Front and Rear 1.13 kg 2.5 lb Refrigerant Charge Suburban with Front and 1.4 kg 3.0 lb 1 If more than the specified amount of PAG oil was drained from a component, add the equal amount of oil drained.
2008 Chevrolet Silverado 1500 2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Refrigerant Leak Testing The fluorescent dye mixes and flows with the polyalkylene glycol (PAG) oil throughout the Verifying some passive leaks may require using the J 39400-A , even though the A/C system The only time that adding additional fluorescent dye is required is after flushing the A/C system. Fluorescent Leak Detector Fluorescent dye will assist in locating any leaks in the A/C system. Condensation on the evaporator core or the refrigerant lines may wash the PAG oil and Leaks in the A/C system will be indicated in a light green or yellow color when using the Use the leak detection lamp in the following areas: All fittings or connections that use seal washers or O-rings All of the A/C components The A/C compressor shaft seal The A/C hoses and pressure switches The HVAC module drain tube, if the evaporator core is suspected of leaking The service port sealing caps The sealing cap is the primary seal for the service ports. Follow the instructions supplied with the J 42220 . See Special Tools. To prevent false diagnosis in the future, thoroughly clean the residual dye from any area IMPORTANT: General Motors vehicles are now manufactured with fluorescent dye installed directly into the air conditioning (A/C) system. IMPORTANT: PAG oil is water soluble.
2008 Chevrolet Silverado 1500 2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fluorescent Dye Injection Not all of the fluorescent dyes are compatible with PAG oil. Some types of dye decrease the R-134A leak detection dye requires time to work. Depending upon the leak rate, a leak may To prevent false diagnosis, thoroughly clean any residual dye from the service port with a Halogen Leak Detector Ensure that the vehicle has at least 0.45 kg (1 lb) of refrigerant in the A/C refrigeration system in Clean and dry all surfaces in order to prevent a false warning. Liquids will damage the detector. IMPORTANT: Use only fluorescent dye approved by General Motors. J 41447 can be poured directly into a removed A/C J 46297-12 is injected into the low side port using J IMPORTANT: Do NOT overcharge the A/C system with dye. Use only one 7.39 ml (0.25 oz) charge. CAUTION: Do not operate the detector in a combustible atmosphere since its sensor operates at high temperatures or personal IMPORTANT: Halogen leak detectors are sensitive to the following items: Windshield washing solutions Many solvents and cleaners Some adhesives used in the vehicle IMPORTANT: Follow a continuous path in order to ensure that you will not miss
2008 Chevrolet Silverado 1500 2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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