Dorman 603-043 Engine Coolant Reservoir - Front

Overview of Dorman Engine Coolant Reservoir for Mazda 3

The Dorman 603-043 engine coolant reservoir is designed specifically for Mazda 3 and Mazda 3 Sport models. This clear plastic coolant reservoir includes a spring loaded twist cap and is engineered to maintain proper coolant levels under pressurized conditions, ensuring reliable engine cooling performance.

• Material: Durable clear plastic construction
• Dimensions: 192 mm length, 140 mm height
• Pressurized reservoir with a maximum cap pressure rating of 21 psi
• Includes one spring loaded twist cap
• Mounting hole quantity: 1 (mounting hardware and brackets not included)
• Package contains 1 coolant reservoir and 1 cap

Detailed Product Description

The Dorman 603-043 engine coolant reservoir is a direct replacement part designed to fit Mazda 3 and Mazda 3 Sport vehicles. Constructed from clear plastic, it allows for easy visual inspection of coolant levels. The reservoir is pressurized, which helps maintain the correct pressure in the cooling system, preventing overheating and coolant loss. The included spring loaded twist cap is rated for a maximum pressure of 21 psi, ensuring a secure seal and proper system function. With a single mounting hole, this reservoir is designed for straightforward installation, although mounting hardware and brackets are not included.

Common Applications and Issues Addressed

• Replacement of cracked or leaking coolant reservoirs
• Resolving coolant overflow or low coolant level warnings
• Fixing coolant system pressure loss due to faulty reservoir caps
• Preventing engine overheating caused by coolant loss
• Maintaining proper coolant circulation in Mazda 3 and 3 Sport models

Installation Notes and Tips

• Verify compatibility with your Mazda 3 or Mazda 3 Sport before installation
• Ensure the old reservoir is fully drained and removed carefully to avoid coolant spills
• Use appropriate mounting hardware as it is not included with this part
• Check the condition of hoses and clamps during installation and replace if necessary
• After installation, refill the cooling system and bleed air to prevent overheating

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM specifications for fit and function. The 603-043 engine coolant reservoir undergoes quality checks to ensure durability and performance. This part includes the coolant reservoir and cap, both designed to maintain system integrity. Please refer to Dorman's warranty policy for specific coverage details.