Segment:
Entry-level luxury sedan
Competitors:
BMW 5 Series, Mercedes-Benz E-Class, Audi A6, Lexus GS
Platform:
GM Sigma platform, rear-wheel drive bias with available all-wheel drive
Powertrain Options:
V8 Northstar engine, V6 High Feature engine
Styling:
Angular, distinctive Cadillac design language of the era
Coverage:
All models, engines, trims, and transmission types for the 2004 Cadillac STS
Page Count:
Not Specified (Downloadable format)
Manual Type:
Complete Workshop Service Repair Manual
Format:
Downloadable (PDF compatible)
Powertrain:
Engine mechanical, fuel system, cooling system, lubrication system, exhaust system, engine control systems (ECM/PCM)
Transmission:
Automatic transmission service, diagnosis, and repair
Drivetrain:
Front-wheel drive (FWD) and all-wheel drive (AWD) components, driveline, axles, differentials
Suspension:
Front and rear suspension, struts, shock absorbers, control arms, bushings, alignment specifications
Steering:
Power steering system, steering rack, tie rods, steering column
Brakes:
Brake system components (rotors, pads, calipers, lines), ABS, traction control, hydraulic system
Electrical:
Battery, charging system, starting system, lighting, power windows, power locks, interior electronics, body control modules (BCM)
HVAC:
Heating, ventilation, and air conditioning systems, refrigerant service
Body:
Body exterior panels, doors, glass, interior trim, structural components
Restraint:
Airbag system, seat belts
Maintenance:
Scheduled maintenance, fluid changes, filter replacements, inspections
Diagnostics:
Troubleshooting guides, diagnostic trouble codes (DTCs), symptom-based diagnostics
Repair:
Step-by-step repair procedures for all major vehicle systems
Overhaul:
Complete engine and transmission overhaul procedures
Component Replacement:
Replacement of individual components within all systems
Wiring Diagrams:
Detailed electrical wiring diagrams for all circuits
Depth:
Comprehensive, from basic maintenance to in-depth engine and transmission rebuilds
File Format:
PDF (Portable Document Format)
Print Quality:
High-quality, printable pages with clear images and text
Binding Type:
Not applicable (downloadable, user prints and binds as needed)
Paper Type:
Not applicable (digital file)
Engine Code V6:
L37 (4.6L Northstar V8) and LY7 (3.6L High Feature V6)
Horsepower V6:
Approximately 275 hp (3.6L V6), 320 hp (4.6L V8 Northstar)
Torque V6:
Approximately 252 lb-ft (3.6L V6), 300 lb-ft (4.6L V8 Northstar)
Fuel Delivery:
Sequential Multi-Port Fuel Injection (MPI)
Timing:
Dual Overhead Camshafts (DOHC), 4 valves per cylinder, timing chains
Transmission Type:
5-speed automatic (5L50-E)
AWD Option:
Available all-wheel drive (AWD) system
Transmission Features:
Driver Shift Control, adaptive shifting
Transmission Fluid Type:
Dexron VI (or equivalent specification)
Length:
Approximately 199.0 inches
Width:
Approximately 71.9 inches
Height:
Approximately 57.7 inches
Curb Weight Rwd:
Approx. 3,800 - 3,950 lbs (V6 RWD)
Curb Weight AWD:
Approx. 4,000 - 4,150 lbs (V6 AWD)
Wheelbase:
Approximately 113.4 inches
Wheel Size:
Standard 17-inch, optional 18-inch alloy wheels
Tire Size Standard:
P235/50R17 (may vary by trim/options)
NHTSA Front Impact:
5-Star (driver and passenger)
NHTSA Side Impact:
5-Star (front and rear passengers)
Traction Control:
StabiliTrak electronic stability control system
ABS:
Anti-lock Braking System (ABS)
Airbags:
Front airbags, side-impact airbags, curtain airbags
Seatbelts:
Three-point seatbelts with pretensioners
Infotainment System:
Cadillac's infotainment system with options for Bose premium audio, CD player, and available navigation.
Driver Assistance Features:
Traction control, StabiliTrak, cruise control
Connectivity Options:
OnStar telematics system (subscription-based)
Comfort Features:
Heated and ventilated front seats, dual-zone climate control, keyless entry
Oil Change Interval:
Every 7,500 miles or 12 months (using synthetic oil, check manual for exact recommendation)
Tire Rotation Interval:
Every 7,500 miles
Coolant Flush Interval:
Refer to manual, typically around 60,000 - 100,000 miles for extended life coolant
Engine Oil Type:
SAE 5W-30 Synthetic (check owner's manual for precise API certification)
Engine Oil Capacity V6:
Approx. 5.5 quarts (4.6L V8), 5.0 quarts (3.6L V6) with filter change
Coolant Type:
Dex-Cool (Orange) Long Life Coolant (GM specification)
Brake Fluid Type:
DOT 3 (check manual for any specific GM formulation)
Northstar V8 Head Gaskets:
While less prevalent on later Northstar engines, early models had known issues; this manual will detail checks and repairs.
Power Steering Leaks:
Potential for leaks in power steering hoses or pump.
Suspension Components:
Wear on control arm bushings, tie rod ends, and struts common with mileage.
PCM Modules:
Occasional electronic module failures, particularly the Powertrain Control Module (PCM).
Cadillac Legacy:
Long history of luxury and technological innovation in American automotive manufacturing
Sts Debut:
Introduced for the 2005 model year, replacing the Seville, this 2004 manual covers the final year of the Seville generation, which the STS is a direct successor to in terms of market positioning and platform strategy.
Manufacturing Location:
Hamtramck, Michigan, USA (GM Detroit/Hamtramck Assembly)
