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    • JTL Parts Coolant Reservoir Tank 603-5201 (Engine Coolant Expansion Tank / Radiator Overflow Reservoir) – Replacement for 05-23045-000 / 05-23045-001 / 05-20529-000 – Freightliner Columbia Heavy Duty Cooling System
    • JTL Parts Coolant Reservoir Tank 603-5201 (Engine Coolant Expansion Tank / Radiator Overflow Reservoir) – Replacement for 05-23045-000 / 05-23045-001 / 05-20529-000 – Freightliner Columbia Heavy Duty Cooling System
    • JTL Parts Coolant Reservoir Tank 603-5201 (Engine Coolant Expansion Tank / Radiator Overflow Reservoir) – Replacement for 05-23045-000 / 05-23045-001 / 05-20529-000 – Freightliner Columbia Heavy Duty Cooling System
    • JTL Parts Coolant Reservoir Tank 603-5201 (Engine Coolant Expansion Tank / Radiator Overflow Reservoir) – Replacement for 05-23045-000 / 05-23045-001 / 05-20529-000 – Freightliner Columbia Heavy Duty Cooling System

    JTL Parts Coolant Reservoir Tank 603-5201 (Engine Coolant Expansion Tank / Radiator Overflow Reservoir) – Replacement for 05-23045-000 / 05-23045-001 / 05-20529-000 – Freightliner Columbia Heavy Duty Cooling System

    Vendor: JTL Parts
    COOLANT RESERVOIR 603-5201 Engine Coolant Tank Replacement for 603-5201 / Freightliner Columbia – Heavy Duty Application The Coolant Reservoir 603-5201 is designed for heavy-duty Freightliner trucks, providing a reliable expansion...
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      COOLANT RESERVOIR 603-5201 Engine Coolant Tank

      Replacement for 603-5201 / Freightliner Columbia – Heavy Duty Application

      The Coolant Reservoir 603-5201 is designed for heavy-duty Freightliner trucks, providing a reliable expansion and storage system for engine coolant. This reservoir helps maintain proper coolant levels, prevents overheating, and ensures stable engine temperature under demanding operating conditions.


      Product Details

      • Part Number: 603-5201
      • Type: Coolant Reservoir / Expansion Tank
      • Application: Engine Cooling System
      • Cross Reference: 603-5201, 05-23045-000, 05-23045-001, 05-20529-000

      Key Benefits

      • Maintains correct coolant level in the system
      • Prevents engine overheating and thermal stress
      • Designed for high-pressure cooling systems
      • Durable construction for heavy-duty trucking applications
      • Helps ensure stable engine temperature control

      Function

      • Stores excess coolant during thermal expansion
      • Returns coolant to the system as temperature changes
      • Maintains pressure balance in the cooling system
      • Supports continuous engine cooling performance

      High-Quality Construction

      • Reinforced high-strength plastic tank
      • Heat and vibration resistant design
      • OEM-style fit and durability
      • Includes pressure-rated cap (15 PSI)

      Vehicle Fitment

      Compatible with heavy-duty Freightliner applications:

      • Freightliner Columbia
      • Freightliner Century Class
      • Freightliner Coronado

      Fits Models

      • Freightliner Columbia 112 / 120
      • Freightliner Century Class
      • Freightliner Coronado

      Note: Fitment may vary depending on engine and configuration. Always verify part number before purchase.

      Replaces / Cross Reference Numbers

      • 603-5201
      • 05-23045-000
      • 05-23045-001
      • 05-20529-000

      Installation

      • Direct replacement design
      • Factory-style mounting points
      • No modifications required

      Package Includes

      • 1 x Coolant Reservoir
      • 1 x Pressure Cap
      Product specifications
      Specification Name Specification Value
      Item condition New
      Item material Plastic
      Manufacturer type Aftermarket

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