OE Quality
60-Day Returns

Four Seasons 45919 Accessory Drive Belt Idler Pulley - Air Conditioning or Power Steering
Reliable Accessory Drive Belt Idler Pulley for Cadillac Vehicles
The Four Seasons Pulley 45919 is a precision-engineered accessory drive belt idler pulley designed specifically for Cadillac CTS, SRX, and STS models. Crafted from durable steel and finished in black, this pulley ensures consistent performance and longevity in your vehicle's serpentine belt system.
Key Features of Four Seasons Pulley 45919
- Constructed from robust steel material for strength and durability
- Black finish for corrosion resistance and aesthetic consistency
- Smooth groove design compatible with serpentine belts
- Inside diameter of 0.671875 inches (17 mm) and outside diameter of 2.75 inches (69.85 mm)
- Width measures 1.18 inches (30 mm), suitable for 1.125 inch (28.575 mm) wide belts
- Back idler pulley type designed for optimal belt tension and routing
- Includes mounting hardware for straightforward installation
- Meets or exceeds OEM specifications for reliable fit and function
Detailed Description of the Four Seasons Pulley 45919
This accessory drive belt idler pulley from Four Seasons is part of the Pulley product line, which focuses on delivering components that maintain proper belt tension and alignment in automotive accessory drive systems. The Pulley line emphasizes durability and precision fitment, making it a suitable replacement part for maintaining the performance of your vehicle’s serpentine belt system.
The 45919 pulley features a smooth groove design, ideal for serpentine belt applications found in Cadillac CTS, SRX, and STS models. Its steel construction provides the necessary strength to withstand the stresses of continuous operation, while the black finish helps resist corrosion. The pulley’s dimensions, including a 0.671875 inch inside diameter and 2.75 inch outside diameter, ensure compatibility with the specified belt widths and vehicle requirements.
Common Applications and Issues Addressed
- Restores proper belt tension and alignment in the accessory drive system
- Eliminates belt slippage caused by worn or damaged idler pulleys
- Prevents premature belt wear and noise from misaligned pulleys
- Replaces faulty or seized pulleys that can cause accessory drive failure
- Supports smooth operation of engine accessories such as alternator and power steering pump
Installation Notes and Tips
When installing the Four Seasons Pulley 45919, ensure the serpentine belt is properly routed according to the vehicle’s service manual. Verify that the pulley spins freely without resistance or noise before final assembly. Use the included mounting hardware to secure the pulley firmly, and double-check belt tension after installation to prevent premature wear.
Quality Assurance and Warranty
The Four Seasons Pulley 45919 meets or exceeds OEM standards, providing reliable performance for Cadillac CTS, SRX, and STS vehicles. This part is manufactured with quality materials and precision engineering to ensure durability and fitment accuracy. Please refer to Four Seasons’ warranty policy for specific coverage details.
| Brand | Four Seasons |
| Part Number | 45919 |
| Position | Pulley, Air Conditioning and Power Steering |
| Material | Steel |
| Color | Black |
| Inside Diameter | 0.671875 |
| Groove Quantity | Smooth |
| Width | 30 |
| Outside Diameter | 2.750 |
| Belt Type | Serpentine |
| Belt Width IN | 1.125 |
| Belt Width MM | 28.575 |
| Bore Dia. IN | .67 |
| Description | Idler / tensioner pulley |
| I.D. MM | 17 |
| Meets / Exceeds OEM? | Yes |
| Mount Hole Qty | 1 |
| Mounting Hardware? | Included |
| O.D. MM | 69.850 |
| Pulley Type | Back idler |
| Pulley Width IN | 1.18 |
| Pulley Width MM | 28.7 |
| Style | Idler / tensioner pulley |
| Type | Pulley |
This part fits 34 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2011 | Cadillac | STS | Air Conditioning | Pulley | ||
| 2011 | Cadillac | STS | Power Steering | Pulley | ||
| 2010 | Cadillac | STS | 3.6L | V6 | Air Conditioning | Pulley |
| 2010 | Cadillac | STS | 3.6L | V6 | Power Steering | Pulley |
| 2009 | Cadillac | CTS | 3.6L | V6 | Air Conditioning | Pulley |
| 2009 | Cadillac | CTS | 3.6L | V6 | Power Steering | Pulley |
| 2009 | Cadillac | SRX | 3.6L | V6 | Air Conditioning | Pulley |
| 2009 | Cadillac | SRX | 3.6L | V6 | Power Steering | Pulley |
| 2009 | Cadillac | STS | 3.6L | V6 | Air Conditioning | Pulley |
| 2009 | Cadillac | STS | 3.6L | V6 | Power Steering | Pulley |
| 2008 | Cadillac | CTS | Air Conditioning | Pulley | ||
| 2008 | Cadillac | CTS | Power Steering | Pulley | ||
| 2008 | Cadillac | STS | 3.6L | V6 | Air Conditioning | Pulley |
| 2008 | Cadillac | STS | 3.6L | V6 | Power Steering | Pulley |
| 2007 | Cadillac | CTS | 2.8L | V6 | Air Conditioning | Pulley |
| 2007 | Cadillac | CTS | 2.8L | V6 | Power Steering | Pulley |
| 2007 | Cadillac | CTS | 3.6L | V6 | Air Conditioning | Pulley |
| 2007 | Cadillac | CTS | 3.6L | V6 | Power Steering | Pulley |
| 2007 | Cadillac | STS | 3.6L | V6 | Air Conditioning | Pulley |
| 2007 | Cadillac | STS | 3.6L | V6 | Power Steering | Pulley |
| 2006 | Cadillac | CTS | 2.8L | V6 | Air Conditioning | Pulley |
| 2006 | Cadillac | CTS | 2.8L | V6 | Power Steering | Pulley |
| 2006 | Cadillac | CTS | 3.6L | V6 | Air Conditioning | Pulley |
| 2006 | Cadillac | CTS | 3.6L | V6 | Power Steering | Pulley |
| 2006 | Cadillac | STS | 3.6L | V6 | Air Conditioning | Pulley |
| 2006 | Cadillac | STS | 3.6L | V6 | Power Steering | Pulley |
| 2005 | Cadillac | CTS | 2.8L | V6 | Air Conditioning | Pulley |
| 2005 | Cadillac | CTS | 2.8L | V6 | Power Steering | Pulley |
| 2005 | Cadillac | CTS | 3.6L | V6 | Air Conditioning | Pulley |
| 2005 | Cadillac | CTS | 3.6L | V6 | Power Steering | Pulley |
| 2005 | Cadillac | STS | 3.6L | V6 | Air Conditioning | Pulley |
| 2005 | Cadillac | STS | 3.6L | V6 | Power Steering | Pulley |
| 2004 | Cadillac | CTS | 3.6L | V6 | Air Conditioning | Pulley |
| 2004 | Cadillac | CTS | 3.6L | V6 | Power Steering | Pulley |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.