🏷️ Basic Information

Make:

Cadillac

Model:

STS

Model Years Covered:

2004, 2005, 2006, 2007

Model Generation:

Second Generation (2005-2012), with specific focus on early models of this generation

Platform:

GM Sigma Platform

👋 Introduction

Vehicle Segment:

Luxury Sedan

Target Audience:

Owners seeking to perform maintenance and repairs themselves, independent repair shops, DIY enthusiasts

Competitors:

BMW 5 Series, Mercedes-Benz E-Class, Audi A6, Lexus GS

Manual Advantage:

Provides the same detailed information used by dealership technicians, offering precise repair procedures and specifications.

Digital Format Benefit:

Easy to navigate, search, print specific sections, and store digitally, avoiding physical wear and tear.

📋 Manual Details

Primary Coverage:

Complete Workshop Service and Repair

Secondary Coverage:

Maintenance, Diagnostics, Troubleshooting, Overhaul, Wiring Schematics, Specifications

Estimated Page Count:

Likely over 2000 pages (typical for comprehensive factory workshop manuals)

Type:

Factory Service Manual (FSM) / Workshop Manual

Language:

English

Digital Format:

PDF

📖 Manual Coverage

Powertrain:

Engine, Control System, Fuel Service, Emission Control, Intake/Exhaust/Cooling, Lube, Ignition, Starting/Charging, Automatic Transmission, Manual Transmission, Transfer Case, Propeller Shaft, Drive Shaft, Differential, Axles

Chassis:

Suspension, Tire & Wheel, Brake Control, Brakes, Parking Brake, Steering Column, Power Steering

Body And Electrical:

Air Conditioning, Supplemental Restraint System (SRS), Seat Belts, Engine Immobilizer, Cruise Control, Wiper & Washer, Door Locks, Meter/Audio/Visual, Horn, Windshield/Glass/Mirrors, Instrument Panel, Seats, Engine Hood/Doors, Exterior & Interior Trim, Electrical Systems, Multiplex/CAN Communication

Routine Maintenance:

Oil changes, filter replacements, fluid checks and top-offs, spark plug replacement, belt inspections/replacement

Diagnostic Procedures:

Troubleshooting guides, diagnostic trouble codes (DTCs), circuit testing, component testing

Repair And Overhaul:

Engine mechanical repairs, transmission service and overhaul, brake system repairs, suspension component replacement, electrical component repair/replacement

Component Replacement:

Detailed instructions for replacing virtually all mechanical and electrical components

Depth:

Factory-level detail, including step-by-step instructions, torque specifications, diagnostic flowcharts, and wiring diagrams

📊 Manual Specifications

Compatibility:

Windows and Mac OS

Required Software:

Adobe PDF Reader, Winzip (or equivalent extraction utility)

Printability:

Fully printable, allowing users to print specific pages or entire sections

Image Resolution:

High resolution for clear illustrations, diagrams, and schematics, with zoom capability

Binding Type:

Digital PDF (no physical binding)

Paper Type:

N/A (Digital format)

⚙️ Engine Specifications

Engine Options:

Northstar V8 (4.6L), naturally aspirated; Luxury Performance variants may include a supercharged option (check specific model year)

Horsepower Range:

Approximately 275-320 hp (naturally aspirated), higher for supercharged variants

Torque Range:

Approximately 295-315 lb-ft (naturally aspirated), higher for supercharged variants

Fuel Delivery:

Sequential Port Fuel Injection (SFI)

Northstar 4.6L V8:

L37 (for performance applications), LD8 (for standard applications)

🔧 Transmission

Type:

4-speed automatic (e.g., 4T80-E) for early models, potentially transitioning to 6-speed automatic (e.g., 6T80) for later models within this range.

Type:

All-Wheel Drive (AWD) often paired with automatic transmissions.

Torque Converter Lockup:

Variable, providing improved fuel economy.

📐 Dimensions

Length:

Approximately 199.8 inches

Width:

Approximately 72.5 inches

Height:

Approximately 57.5 inches

Curb Weight:

Approximately 3,800 - 4,100 lbs depending on powertrain and features.

Gross Vehicle Weight Rating:

Typically around 5,000 lbs.

🛡️ Safety Features

NHTSA Front Impact:

5-Star (for driver and passenger, for applicable models/tests)

IIHS Side Impact:

Good (for applicable models/tests)

Stability Control:

StabiliTrak (Electronic Stability Control)

Traction Control:

Traction Control System (TCS)

Braking System:

Anti-lock Braking System (ABS), Electronic Brake-force Distribution (EBD)

Airbags:

Frontal airbags, side-impact airbags, available side curtain airbags

Seat Belts:

3-point front and rear seat belts with pretensioners and load limiters

💡 Technology Features

Navigation System:

Optional DVD-based or hard-drive-based navigation system with touchscreen interface.

Audio System:

Bose premium audio system with multiple speakers and CD player, potentially with MP3 capability.

Parking Assist:

Optional rear parking assist sensors.

Adaptive Cruise Control:

Available on some models, maintaining a set distance from the vehicle ahead.

Onstar:

Available OnStar telematics system for emergency services, diagnostics, and hands-free communication.

Heated Cooled Seats:

Available heated and ventilated front seats.

Remote Start:

Standard on many models, allowing remote engine start.

🔧 Maintenance

Oil Change Interval:

Typically 5,000 - 7,500 miles or 6 months, depending on driving conditions and oil type used (refer to manual for specific recommendations like Dexos or equivalent).

Coolant Flush:

Every 50,000 - 100,000 miles or 5 years (consult manual for specific coolant type like Dex-Cool).

Spark Plug Replacement:

Typically around 100,000 miles for iridium-tipped plugs.

Engine Oil:

SAE 5W-30 synthetic recommended for Northstar engines (API certified).

Transmission Fluid:

Dexron VI (for 6-speed automatic), Dexron III H or equivalent (for 4-speed automatic) - consult manual for exact specification.

Coolant:

GM P/N 12346290 (Dex-Cool), a 50/50 mix of coolant and distilled water.

Northstar Head Gaskets:

Early Northstar engines were prone to head gasket failures due to thread inserts. While improved in later generations, it's a potential concern. The manual will detail inspection and repair procedures.

Suspension Components:

Air suspension components (if equipped) and magnetic ride control dampers can be expensive to replace. The manual covers their diagnostics and service.

📚 Vehicle History

Cadillac Legacy:

Long-standing American luxury brand known for comfort, performance, and innovative technology.

Sts Introduction:

The STS (Seville STS) was a flagship luxury sedan for Cadillac, evolving from the Seville lineage. The 2005 model year marked the introduction of the second generation, built on a new rear-wheel-drive platform.

Manufacturing Location:

Lansing Grand River Assembly, Lansing, Michigan, USA

🏆 Awards & Recognition

Jdpower Dependability:

Cadillac generally ranked well in J.D. Power dependability studies during this era, particularly for luxury vehicles.

Caranddriver 10Best:

The STS often competed in segments where vehicles were evaluated for inclusion in lists like Car and Driver's 10Best, reflecting its performance and luxury attributes.