Dorman 603-535 Engine Coolant Reservoir - Front

Reliable Engine Coolant Reservoir for BMW Models

The Dorman 603-535 engine coolant reservoir is designed to maintain optimal coolant levels and pressure in your BMW vehicle's cooling system. Engineered from durable plastic, this reservoir is compatible with a range of BMW models including the 320i, 325i, 328i, 330i, X1, X3, and X5.

• Constructed from high-quality plastic for durability and corrosion resistance
• Includes a spring loaded twist cap rated for 30 psi maximum pressure
• Equipped with a level sensor to monitor coolant levels accurately
• Pressurized design to maintain proper cooling system pressure
• Compatible with multiple BMW models such as 320i, 325xi, 328Ci, 330xi, and X5
• Package contains 1 coolant reservoir, 1 cap, and 1 level sensor
• Single mounting hole for secure installation (mounting hardware not included)

Product Details and Specifications

The Dorman 603-535 engine coolant reservoir measures 107 mm in length and 364 mm in height, providing a precise fit for select BMW vehicles. Its black plastic construction offers resistance to heat and chemical exposure common in engine compartments. The included spring loaded twist cap is designed to maintain a maximum pressure of 30 psi, ensuring the cooling system operates within safe parameters. This reservoir is pressurized and comes with an integrated coolant level sensor, allowing for accurate monitoring of coolant levels to prevent overheating or engine damage.

Compatible BMW Models and Applications

This engine coolant reservoir is compatible with a variety of BMW models, including but not limited to:

• BMW 320i, 323Ci, 323i, 323ti
• BMW 325Ci, 325i, 325xi
• BMW 328Ci, 328i
• BMW 330Ci, 330i, 330xi
• BMW X1, X3, X5

Common Issues Addressed by This Coolant Reservoir

• Coolant leaks due to cracked or damaged reservoirs
• Inaccurate coolant level readings from faulty sensors
• Loss of cooling system pressure causing engine overheating
• Failure of the reservoir cap leading to coolant evaporation
• Corrosion or wear in original plastic reservoirs

Installation Notes and Tips

Installation of the Dorman 603-535 engine coolant reservoir requires removal of the old reservoir and proper connection of the included level sensor and cap. Note that mounting hardware and brackets are not included, so retain original components or source compatible hardware. Ensure all connections are secure and check for leaks after installation. This part is designed for direct replacement on compatible BMW models, but professional installation is recommended for optimal results.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 603-535 engine coolant reservoir undergoes rigorous quality control to ensure durability and reliability. While specific warranty details may vary, Dorman typically offers limited warranties covering defects in material and workmanship. Consult product documentation or the manufacturer for exact warranty terms.