Dorman 603-336 Engine Coolant Reservoir - Front

Overview of Dorman Engine Coolant Reservoir for BMW X5 and Z3

The Dorman 603-336 engine coolant reservoir is designed specifically for BMW X5 and Z3 models. This black plastic coolant reservoir includes a spring loaded twist cap and is engineered to maintain proper coolant pressure and fluid levels in your vehicle's cooling system.

• Durable black plastic construction
• Includes one coolant reservoir and one spring loaded twist cap
• Pressurized system with a cap maximum pressure rating of 22 psi
• Two mounting holes for secure installation
• Cap included with the reservoir for a complete replacement

Detailed Product Description

The Dorman 603-336 engine coolant reservoir is a direct replacement part compatible with BMW X5 and Z3 vehicles. Made from durable plastic, this reservoir is designed to withstand the heat and pressure of the engine cooling system. The included spring loaded twist cap is rated for a maximum pressure of 22 psi, ensuring the system remains pressurized to prevent coolant loss and overheating. With two mounting holes, the reservoir can be securely attached without the need for additional mounting brackets or hardware, which are not included. This part number 603-336 provides a reliable solution for maintaining proper coolant levels and system pressure.

Common Issues Addressed by This Coolant Reservoir

• Coolant leaks due to cracked or damaged reservoir tanks
• Loss of coolant pressure causing engine overheating
• Faulty or missing coolant reservoir caps
• Coolant contamination from damaged or worn reservoirs
• Inadequate coolant level monitoring due to reservoir failure

Installation Notes and Tips

Installation of the Dorman 603-336 engine coolant reservoir requires no additional mounting hardware or brackets, as it uses the existing two mounting holes on compatible BMW X5 and Z3 models. Ensure the old reservoir is fully drained and removed carefully to avoid coolant spillage. When installing the new reservoir, verify the spring loaded twist cap is properly seated and tightened to maintain system pressure. It is recommended to inspect hoses and clamps during installation for any signs of wear or damage.

Quality Assurance and Warranty Information

Dorman parts are manufactured to meet or exceed OEM specifications for fit, form, and function. The 603-336 engine coolant reservoir undergoes quality checks to ensure durability and performance in BMW X5 and Z3 vehicles. While specific warranty details are not provided here, Dorman typically offers limited warranties on their replacement parts. Consult product documentation or the manufacturer for exact warranty terms.