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 1569 (ENGINE COOLING SYSTEM)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 is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
FASTENER TIGHTENING SPECIFICATIONS
| Application | Specification | |
|---|---|---|
| Metric | English | |
| Air Cleaner Outlet Duct Clamp (6.6L) | 6 N.m | 53 lb in |
| Air Cleaner Outlet Duct Clamp Screw (4.8L, 5.3L, and 6.0L) | 7 N.m | 62 lb in |
| Air Conditioning (A/C) Compressor Mounting Bolt (6.6L) | 50 N.m | 37 lb ft |
| Bypass Pipe to Water Pump Bolt (6.6L) | 21 N.m | 16 lb ft |
| Charged Air Cooler Duct Clamp (6.6L) | 6 N.m | 53 lb in |
| Coolant Air Bleed Pipe Stud/Bolt (4.8L, 5.3L, and 6.0L) | 12 N.m | 106 lb in |
| Coolant Crossover Bolt (8.1 L) | 50 N.m | 37 lb ft |
| Coolant Heater Bolt (6.6L) | 2 N.m | 18 lb in |
| Coolant Heater Cord Bolt | 8 N.m | 71 lb in |
| Coolant Heater Bolt (4.3L) | 2 N.m | 18 lb in |
| Coolant Heater (4.8L, 5.3L, and 6.0L) | 50 N.m | 37 lb ft |
| Coolant Heater (8.1 L) | 60 N.m | 47 lb ft |
| Engine Block Coolant Drain Plug (4.3L) | 20 N.m | 15 lb ft |
| Engine Block Coolant Drain Plug (4.8L, 5.3L, 6.0L, and 8.1 L) | 60 N.m | 44 lb ft |
| Engine Block Coolant Drain Plug (6.6L) | 18 N.m | 13 lb ft |
| Engine Coolant Temperature (ECT) Sensor (6.6L) | 33 N.m | 24 lb ft |
| Engine Shield Bolt | 20 N.m | 15 lb ft |
| Exhaust Manifold Pipe Nut (4.8L, 5.3L, and 6.0L) | 50 N.m | 37 lb ft |
| Fan Clutch Bolt | 23 N.m | 17 lb ft |
| Fan Clutch Nut | 56 N.m | 41 lb ft |
| Fan Pulley Bolt/Nut (6.6L) | 46 N.m | 34 lb ft |
| Fan Shroud Bolt | 9 N.m | 80 lb in |
| Fan and Water Pump Pulley Bolt (4.3L) | 25 N.m | 18 lb ft |
| Fuel Line Bracket Bolt (6.6L) | 21 N.m | 15 lb ft |
| Fuel Line to Fuel Injection Control Module Bolt (6.6L) | 35 N.m | 26 lb ft |
| Generator Bracket Bolt (6.6L) | 50 N.m | 37 lb ft |
| Generator Bracket Stud (8.1 L) | 20 N.m | 15 lb ft |
| Generator Positive Cable Nut (6.6L) | 9 N.m | 80 lb in |
| Heater Pipe to Fuel Filter Bolt (6.6L) | 21 N.m | 16 lb ft |
| Heater Pipe to Thermostat Bolt (6.6L) | 21 N.m | 16 lb ft |
| Heater Outlet Hose Bracket Bolt (6.6L) | 21 N.m | 16 lb ft |
| Idler Pulley Bolt (6.6L) | 43 N.m | 32 lb ft |
| Junction Block Bracket Bolt (6.6L) | 9 N.m | 80 lb in |
| Oil Cooler Hose Adapter Bolt (6.0L) | 12 N.m | 106 lb in |
| Oil Cooler Hose Bracket Bolt (6.0L) | 25 N.m | 18 lb ft |
| Oil Cooler Hose Bracket Bolt (8.1 L) | 50 N.m | 37 lb ft |
| Positive Crankcase Ventilation (PCV) Oil Separator Bracket Nut (6.6L) | 21 N.m | 16 lb ft |
| Power Steering Pump Bracket Bolt (6.6L) | 46 N.m | 34 lb ft |
| Radiator Bolt | 25 N.m | 18 lb ft |
| Surge Tank Bolt/Nut | 9 N.m | 80 lb in |
| Thermostat Housing Cover Bolt (6.6L) | 21 N.m | 16 lb ft |
| Thermostat Housing Bolt (4.8L, 5.3L, and 6.0L) | 15 N.m | 11 lb ft |
| Thermostat Housing Bolt (8.1 L) | 37 N.m | 27 lb ft |
| Thermostat Crossover Bolt (6.6L) | 21 N.m | 16 lb ft |
| Transmission Control Module (TCM) Cover Bolt | 9 N.m | 80 lb in |
| Transmission Control Module (TCM) Electrical Connector Bolt | 8 N.m | 71 lb in |
| Turbocharger Coolant Bypass Valve (6.6L) | 60 N.m | 44 lb ft |
| Turbocharger Outlet Coolant Pipe to Pipe Bracket Bolt (6.6L) | 21 N.m | 16 lb ft |
| Turbocharger Outlet Coolant Pipe Nut (6.6L) | 9 N.m | 80 lb in |
| Water Outlet Bolt (8.1 L) | 30 N.m | 22 lb ft |
| Water Outlet Stud (4.3L) | 25 N.m | 18 lb ft |
| Water Outlet Tube to Thermostat Housing Bolt (6.6L) | 21 N.m | 16 lb ft |
| Water Outlet Tube to Valve Rocker Arm Cover Bolt (6.6L) | 21 N.m | 16 lb ft |
| Water Pump Bolt (4.3L) | 45 N.m | 33 lb ft |
| Water Pump Bolt (First Pass) (4.8L, 5.3L, and 6.0L) | 15 N.m | 11 lb ft |
| Water Pump Bolt (Final Pass) (4.8L, 5.3L, and 6.0L) | 30 N.m | 22 lb ft |
| Water Pump Bolt (6.6L) | 21 N.m | 16 lb ft |
| Water Pump Bolt (8.1L) | 50 N.m | 37 lb ft |
| Water Pump to Water Pump Housing Bolt (6.6L) | 21 N.m | 16 lb ft |
| Water Pump to Water Pump Outlet Pipe Nuts (6.6L) | 21 N.m | 16 lb ft |
| Wiring Harness Bracket to Thermost Housing Bolt (6.6L) | 8 N.m | 71 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.