Fastener Tightening Specifications
| Application | Specification | |
|---|---|---|
| Metric | English | |
| A/C High Pressure Recirculation Switch | 6 N.m | 53 lb in |
| A/C Low Pressure Switch | 6 N.m | 53 lb in |
| A/C Refrigerant Filter Retaining Nuts | 15 N.m | 11 lb ft |
| Accumulator Bracket Nut | 9 N.m | 80 lb in |
| Accumulator Clamp Bolt | 10 N.m | 8 lb ft |
| Air Distribution Duct Screws | 1.6 N.m | 14 lb in |
| Air Outlet Mounting Screw | 1.6 N.m | 14 lb in |
| Auxiliary A/C Tubes at the Auxiliary HVAC Module | 16 N.m | 12 lb ft |
| Auxiliary Evaporator Tube to TXV Nut | 28 N.m | 21 lb ft |
| Auxiliary HVAC Module A/C Line Nut | 16 N.m | 12 lb ft |
| Auxiliary HVAC Module Mounting Nuts to Vehicle | 9 N.m | 80 lb in |
| Blower Motor Insulating Cover Screw | 1.6 N.m | 14 lb in |
| Blower Motor Relay/Resistor Screw | 1.6 N.m | 14 lb in |
| Compressor Bracket Mounting Bolts | 50 N.m | 37 lb ft |
| Compressor Clutch Coil Connector Retaining Bracket Screw | 9 N.m | 80 lb in |
| Compressor Clutch Plate Retaining Bolt | 18 N.m | 13 lb ft |
| Compressor Discharge Hose Nut at Compressor | 16 N.m | 12 lb ft |
| Compressor Hose Bolt to Compressor (L18 Harrison) | 34 N.m | 25 lb ft |
| Compressor Mounting Bolts (L18 Harrison) | 50 N.m | 37 lb ft |
| Compressor Mounting Bolts (LR4, LM7, LQ4 Denso) | 50 N.m | 37 lb ft |
| Compressor Suction/Discharge Hose Bolt | 34 N.m | 25 lb ft |
| Compressor Suction Hose Nut to Accumulator | 16 N.m | 12 lb ft |
| 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 Denso) | 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 Denso) | 16 N.m | 12 lb ft |
Refrigerant System Capacities (Non-HP2)
| Application | Specification | |
|---|---|---|
| Metric | English | |
| PAG Oil GM P/N 12378526 for United States PAG Oil GM P/N 88900060 for Canada | ||
| Accumulator Replacement | 60 ml* | 2 oz.* |
| * Add PAG oil equal to the amount of oil drained from the accumulator plus the specified additional amount. | ||
| 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 |
| 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 A/C | 330 ml | 11 oz. |
| R-134a | ||
| Refrigerant Charge | 0.7 kg | 1.6 lb |
| Refrigerant Charge Utility with Front and Rear A/C | 1.13 kg | 2.5 lb |
| Refrigerant Charge Suburban with Front and Rear A/C | 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. | ||
Begin the system diagnosis with Diagnostic System Check - Vehicle . The Diagnostic System Check - Vehicle will provide the following information
- 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 vehicle diagnosis. These must be performed before system DTC or symptom diagnosis.