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Introduction
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Market Position
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Positioning:
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The Chevrolet Colorado (GMT355 platform) was introduced as a competitor in the growing compact pickup truck segment, offering a balance of utility, efficiency, and modern features.
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Competitive Analysis
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Competitors:
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Ford Ranger, Toyota Tacoma, Nissan Frontier, Mazda B-Series
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Key Features
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Unique Selling Points:
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Availability of the I-5 engine for enhanced power and towing, robust chassis, modern styling for its era, and competitive pricing. This manual provides the necessary technical data to maintain and repair these features.
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Manual Advantages
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Convenience:
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Instant online access, compatible with various devices (PC, laptop, smartphone, tablet), eliminating the need for physical storage and offering searchability. Annual access with renewal options.
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Manual Coverage
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Systems Covered
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Engine:
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2.8L I-4 (LLC), 3.5L I-5 (L52), 2.8L I-4 Duramax Diesel (optional in later models, but not typically 2005)
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Transmission:
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4-speed automatic (4L60-E, 4L65-E), 5-speed manual (MA5)
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Drivetrain:
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Rear-Wheel Drive (RWD), Four-Wheel Drive (4WD)
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Brakes:
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Front disc, rear drum (standard); Rear disc (optional/higher trims)
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Suspension:
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Independent front suspension (torsion bar), solid rear axle with leaf springs
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Steering:
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Power rack and pinion
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Electrical:
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Complete wiring diagrams, charging system, starting system, lighting, accessories, body control modules (BCM)
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HVAC:
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Heating, ventilation, and air conditioning system diagnostics and repair
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Body:
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Exterior and interior panel removal, replacement, and repair; door systems, glass, trim
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Restraints:
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Airbag system diagnosis and service
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Procedures Included
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Maintenance:
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Oil change, fluid checks and changes, filter replacements, spark plug replacement, belt inspection and replacement
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Troubleshooting:
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Diagnostic trouble codes (DTCs), symptom-based diagnostics, pinpoint tests
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Repair:
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Engine component replacement (e.g., water pump, alternator), transmission overhaul, brake pad/rotor replacement, suspension component replacement, exhaust system repair, electrical component diagnosis and replacement
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Diagnostics:
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Engine performance diagnostics, transmission control diagnostics, ABS system diagnostics, HVAC system diagnostics
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Recalibration:
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Throttle body relearn, idle learn procedures
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Technical Depth
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Depth:
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Comprehensive factory-level repair procedures, including detailed step-by-step instructions, specifications, and torque values. Suitable for advanced DIY and professional technicians.
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Engine Specifications
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Primary Engine
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2.8L I-4 (Llc):
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Displacement: 2.8 L (171 cu in), Bore x Stroke: 3.70 x 3.70 in (94 x 94 mm), Compression Ratio: 9.1:1, Horsepower: 175 hp @ 5600 rpm, Torque: 185 lb-ft @ 2800 rpm
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3.5L I-5 (L52):
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Displacement: 3.5 L (211 cu in), Bore x Stroke: 3.70 x 3.70 in (94 x 94 mm), Compression Ratio: 9.7:1, Horsepower: 201 hp @ 5600 rpm, Torque: 220 lb-ft @ 2800 rpm
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Performance
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Fuel Type:
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Unleaded gasoline
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Fuel System
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Injection Type:
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Sequential Fuel Injection (SFI)
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Cooling System
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Coolant Type:
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GM Dex-Cool Extended Life Antifreeze/Coolant (or equivalent) orange color
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Ignition System
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Spark Plugs:
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Typically platinum or iridium tipped. Manual will specify exact type and gap. For example, ACDelco 41-993 or equivalent.
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Maintenance
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Service Intervals
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Oil Change:
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Typically every 7,500 miles (12,000 km) or 6 months, whichever comes first, under normal driving conditions. Severe driving conditions may require more frequent changes. Consult manual for specific interval and oil type.
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Air Filter Replacement:
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Inspect every 15,000 miles (24,000 km), replace as needed. Recommended replacement interval typically 30,000 miles (48,000 km).
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Coolant Flush:
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First change at 5 years or 150,000 miles (240,000 km), then every 2-5 years or 150,000 miles (240,000 km) depending on coolant type (Dex-Cool typically has longer intervals).
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Fluid Specifications
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Engine Oil Capacity 2.8L:
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5.2 quarts (4.9 liters) with filter. Oil Specification: SAE 5W-30, API certified.
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Engine Oil Capacity 3.5L:
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5.2 quarts (4.9 liters) with filter. Oil Specification: SAE 5W-30, API certified.
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Brake Fluid Type:
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DOT 3 or DOT 4, per GM specification.
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Power Steering Fluid:
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GM Power Steering Fluid (or equivalent DEXRON III/VI ATF)
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Known Issues
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Intake Manifold Gasket:
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Some 3.5L I-5 engines may experience intake manifold gasket leaks. The manual will detail the replacement procedure.
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Rear Main Seal:
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Potential for rear main seal leaks on various engine and transmission configurations. Repair procedures are covered.
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Suspension Component Wear:
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As with most trucks, front suspension components like ball joints and tie rod ends can experience wear over time. The manual provides inspection and replacement guides.
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Climate Control Actuators:
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HVAC blend door actuators can fail, causing temperature control issues. The manual will help diagnose and replace these small but critical components.
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