Koyorad A2303 Radiator

Koyorad A2303 Radiator for Mazda Protege

The Koyorad A2303 radiator is an OE-equivalent replacement built for 1999-2003 Mazda Protege and 2002-2003 Mazda Protege5 applications. It combines an aluminum core with plastic tanks and includes an internal transmission oil cooler for direct-fit cooling system service.

Key Features

• Fits 1999-2003 Mazda Protege and 2002-2003 Mazda Protege5
• OE-equivalent replacement radiator from Koyorad
• Aluminum core with a single-row design
• Plastic tank construction
• Internal transmission oil cooler included
• Inlet and outlet diameters: 1.125 in.
• Core dimensions: 12.8125 in. height, 27.625 in. width, 0.625 in. thickness

Product Details

Koyorad Radiator A2303 is built for drivers replacing a worn or leaking cooling unit on a Mazda Protege or Mazda Protege5. The aluminum core supports efficient heat transfer, while the integrated transmission oil cooler helps maintain fluid temperature in vehicles equipped with an automatic transmission cooling circuit. This radiator is sized for the listed fitments and follows OE-style replacement requirements for a straightforward service part selection.

Koyorad focuses on replacement radiators that match original equipment expectations for fit and function. The A2303 reflects that approach with application-specific dimensions, standard inlet and outlet sizing, and a design intended for the Mazda Protege platform.

Common Reasons to Replace

• Coolant leaks from a damaged radiator tank or core
• Overheating caused by restricted coolant flow
• Transmission fluid temperature issues related to a failing cooler circuit
• Corrosion or age-related deterioration in the original radiator
• Reduced cooling performance on a Mazda Protege or Mazda Protege5

Installation Notes

Verify radiator dimensions, hose connection sizes, and transmission cooler line routing before installation. Flush the cooling system, inspect hoses and clamps, and confirm the cooling fan, thermostat, and cap are in serviceable condition. Fits 1999-2003 Mazda Protege and 2002-2003 Mazda Protege5, so confirm the vehicle’s transmission cooling setup matches the listed application before replacement.

Quality Assurance

Koyorad manufactures OE-equivalent radiators using application-specific engineering and replacement-focused construction. Part number A2303 is built to meet the needs of the listed Mazda Protege and Mazda Protege5 applications with the correct core layout and integrated transmission oil cooler. This part cross-references no listed aftermarket part numbers for the same application.