HomeBelts and Cooling > Radiators, Coolers and Related ComponentsDorman 603-135 Engine Coolant Reservoir - Front
Part #: 603-135

Dorman 603-135 Engine Coolant Reservoir - Front

Front
⚙️ 6 vehicles fit this part
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Select your vehicle to confirm fitment
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OE Direct Replacement — Bolt-on fit, no modifications needed
🚗Fitment: Ford and Mercury, Escape and Mariner
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Overview of Dorman Engine Coolant Reservoir for Ford Escape and Mercury Mariner

The Dorman 603-135 engine coolant reservoir is designed specifically for Ford Escape and Mercury Mariner models. Made from durable clear plastic, this pressurized coolant reservoir includes a spring loaded twist cap rated for a maximum pressure of 17 psi, ensuring reliable performance in your vehicle's cooling system.

  • Material: Clear plastic construction for easy fluid level monitoring
  • Pressurized reservoir with a spring loaded twist cap included
  • Cap maximum pressure rating of 17 psi for optimal system pressure
  • Includes one coolant reservoir and one cap in the package
  • Two mounting holes for secure installation (mounting hardware and brackets not included)

Detailed Product Description

The Dorman 603-135 engine coolant reservoir is engineered to meet the cooling system requirements of Ford Escape and Mercury Mariner vehicles. Its clear plastic material allows for quick visual inspection of coolant levels without removing the cap. The reservoir is pressurized to maintain proper coolant flow and pressure, with a spring loaded twist cap that helps prevent leaks and maintains system integrity. The cap included with this reservoir is rated for a maximum pressure of 17 psi, which aligns with the specifications of the original equipment. The reservoir features two mounting holes for installation, though mounting hardware and brackets are not included, allowing for compatibility with existing vehicle mounts.

Common Applications and Issues Addressed

  • Replacement of cracked or leaking coolant reservoirs in Ford Escape and Mercury Mariner
  • Restoring proper coolant pressure to prevent overheating
  • Resolving coolant loss due to damaged or faulty reservoir caps
  • Maintaining coolant system integrity after collision or wear
  • Ensuring accurate coolant level monitoring with clear reservoir material

Installation Notes and Tips

When installing the Dorman 603-135 engine coolant reservoir, ensure the vehicle is cool to avoid injury from hot coolant. Use the existing mounting hardware or brackets from the original reservoir, as this product does not include them. Verify that the spring loaded twist cap is securely tightened to maintain system pressure. After installation, check for leaks and proper coolant levels before operating the vehicle.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 603-135 engine coolant reservoir undergoes quality inspections to ensure durability and performance. Please refer to Dorman's warranty policy for specific coverage details.

BrandDorman
Part Number603-135
Cap IncludedYes
Cap Maximum Pressure Rating17
Cap TypeSpring Loaded Twist
ColorClear
MaterialPlastic
Mounting Brackets IncludedNo
Mounting Hardware IncludedNo
Mounting Hole Quantity2
Package Contents1 Coolant Reservoir; 1 Cap
PressurizedYes

This part fits 6 vehicles. Search below:

YearMakeModelLitersCylindersFuel TypePositionNotes
2007FordEscape2.3LL4GASFront
2007MercuryMariner2.3LL4GASFront
2006FordEscape2.3LL4GASFront
2006MercuryMariner2.3LL4GASFront
2005FordEscape2.3LL4GASFront
2005MercuryMariner2.3LL4GASFront

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

58808A5L8Z8A080AADAKG-YL8Z8AFRT1513CFRT1529CSK603135

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.