Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1443 (HVAC SYSTEMS - GENERAL SERVICING)SPECIFICATIONSFASTENER TIGHTENING SPECIFICATIONS
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Fastener Tightening Specifications
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Fastener Tightening Specifications
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Fastener Tightening Specifications
| Application | Specification | |
|---|---|---|
| Metric | English | |
| A/C Compressor Cycling Switch | 5 N.m | 44 lb in |
| A/C Compressor Mounting Bolt | 50 N.m | 37 lb ft |
| A/C Compressor Rear Bracket Bolt | 25 N.m | 18 lb ft |
| A/C Evaporator and Blower Module Shield Screws | 2.2 N.m | 19 lb in |
| A/C Refrigerant Pressure Sensor | 4.8 N.m | 42 lb in |
| Accumulator Clamp Screw | 10 N.m | 88 lb in |
| Accumulator to Evaporator Fitting | 28 N.m | 21 lb ft |
| Air Distributor Duct Mounting Screw | 1.9 N.m | 17 lb in |
| Air Inlet Assembly Mounting Stud | 4.5 N.m | 40 lb in |
| Air Outlet Assembly Retaining Screw | 2.5 N.m | 22 lb in |
| Air Temperature Actuator Retaining Screw | 1.9 N.m | 17 lb in |
| Blower Assembly Mounting Nut (RPO C42) | 4.5 N.m | 40 lb in |
| Blower Assembly Mounting Screw (RPO C42) | 4.5 N.m | 40 lb in |
| Blower Assembly Mounting Stud (RPO C42) | 4.5 N.m | 40 lb in |
| Blower Motor Access Cover Screw (RPO C60 and C68) | 2.5 N.m | 22 lb in |
| Blower Motor and Fan Assembly Mounting Screw | 1.9 N.m | 17 lb in |
| Blower Motor Relay Bracket Mounting Screw | 1.9 N.m | 17 lb in |
| Blower Motor Resistor Mounting Screw | 1.9 N.m | 17 lb in |
| Body Harness Connector Support Bracket Mounting Nuts | 9.0 N.m | 80 lb in |
| Compressor Discharge Hose to Condenser Fitting | 28 N.m | 21 lb ft |
| Compressor Pressure Relief Valve | 9 N.m | 80 lb in |
| Compressor Suction/Discharge Hose to Compressor Bolt | 33 N.m | 24 lb ft |
| Compressor Suction Hose to Accumulator Fitting | 48 N.m | 35 lb ft |
| Condenser Insulator Retaining Screw | 1.9 N.m | 17 lb in |
| Evaporator Case Section to Blower Case Section Retaining Screw | 1.9 N.m | 17 lb in |
| Evaporator Tube Clip Screw | 1.9 N.m | 17 lb in |
| Evaporator Tube to Condenser Fitting | 28 N.m | 21 lb ft |
| Floor Air Outlet Mounting Screw | 1.9 N.m | 17 lb in |
| Heater Core Access Cover Screw | 1.9 N.m | 17 lb in |
| Heater Inlet and Outlet Hoses Bracket Bolt | 25 N.m | 18 lb ft |
| Heater Inlet Hose Fitting at Intake Manifold | 23.5 N.m | 17 lb ft |
| Heater Outlet Hose Bracket Bolt | 25 N.m | 18 lb ft |
| Heater/Vent Module Mounting Nut | 4.5 N.m | 40 lb in |
| Heater/Vent Module Mounting Screw | 4.5 N.m | 40 lb in |
| Heater/Vent Module Mounting Stud | 4.5 N.m | 40 lb in |
| Intermediate Bracket Bolts | 10 N.m | 88 lb in |
| Knee Bolster Bracket Nuts | 5.5 N.m | 49 lb in |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.