OE Quality
60-Day Returns

Dorman 603-331 Engine Coolant Reservoir - Front
Overview of Dorman Engine Coolant Reservoir for Mini Cooper
The Dorman 603-331 engine coolant reservoir is designed specifically for Mini Cooper models, providing a reliable replacement part to maintain your vehicle's cooling system. Made from durable white plastic, this reservoir includes a cap and is engineered to meet the cooling needs of your Mini Cooper.
- Constructed from durable white plastic material
- Includes one coolant reservoir and one cap
- Features a single mounting hole for secure installation
- Cap type included for proper sealing
- Non-pressurized design suitable for Mini Cooper cooling systems
Detailed Product Description
This engine coolant reservoir by Dorman (part number 603-331) is tailored for Mini Cooper vehicles, ensuring compatibility and proper fitment. The reservoir is made from sturdy plastic, which resists corrosion and withstands the heat generated by the engine. Its white color allows for easy fluid level inspection. The included cap is designed to seal the reservoir effectively, preventing coolant loss and contamination. Although mounting hardware and brackets are not included, the reservoir features one mounting hole to facilitate installation using existing vehicle components.
Common Applications and Problem Resolution
This coolant reservoir is used to store excess engine coolant and maintain proper fluid levels within the cooling system. It helps prevent overheating and engine damage by allowing coolant expansion and contraction during temperature changes.
- Replaces cracked or leaking coolant reservoirs
- Solves coolant overflow issues
- Prevents engine overheating due to low coolant levels
- Restores proper coolant containment after cap failure
- Addresses coolant contamination from damaged reservoirs
Installation Notes and Tips
Installation of the Dorman 603-331 reservoir requires removal of the old reservoir and securing the new one using the existing mounting point on the Mini Cooper. Since mounting hardware and brackets are not included, retain original components for reinstallation. Ensure the cap is properly tightened to avoid leaks. It is recommended to check coolant levels and refill as necessary after installation.
Quality Assurance and Warranty
Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 603-331 engine coolant reservoir undergoes quality inspections to ensure durability and performance. Warranty coverage details can be obtained from Dorman or the product documentation to confirm protection against defects.
| Brand | Dorman |
| Part Number | 603-331 |
| Cap Included | Yes |
| Cap Type | Yes |
| Color | White |
| Material | Plastic |
| Mounting Brackets Included | No |
| Mounting Hardware Included | No |
| Mounting Hole Quantity | 1 |
| Package Contents | 1 Coolant Reservoir; 1 Cap |
| Pressurized | No |
This part fits 12 vehicles. Search below:
| Year | Make | Model | Submodel | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2008 | Mini | Cooper | S | 1.6L | L4 | Front | |
| 2007 | Mini | Cooper | S | 1.6L | L4 | Front | |
| 2007 | Mini | Cooper | S Chili | 1.6L | L4 | Front | |
| 2007 | Mini | Cooper | S Hot Chili | 1.6L | L4 | Front | |
| 2007 | Mini | Cooper | S Salt | 1.6L | L4 | Front | |
| 2006 | Mini | Cooper | 1.6L | L4 | Front | ||
| 2006 | Mini | Cooper | S | 1.6L | L4 | Front | |
| 2005 | Mini | Cooper | 1.6L | L4 | Front | ||
| 2005 | Mini | Cooper | S | 1.6L | L4 | Front | |
| 2004 | Mini | Cooper | 1.6L | L4 | Front | ||
| 2003 | Mini | Cooper | 1.6L | L4 | Front | ||
| 2002 | Mini | Cooper | 1.6L | L4 | Front |
* 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.