HomeBelts and Cooling > Radiators, Coolers and Related ComponentsDorman 603-340 Engine Coolant Reservoir - Front
Part #: 603-340

Dorman 603-340 Engine Coolant Reservoir - Front

Front
⚙️ 4 vehicles fit this part
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OE Direct Replacement — Bolt-on fit, no modifications needed
🚗Fitment: Ford, Focus
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Overview of Dorman Engine Coolant Reservoir for Ford Focus

The Dorman 603-340 engine coolant reservoir is designed specifically for Ford Focus models, providing a reliable replacement for your vehicle's cooling system. Made from durable white plastic, this reservoir includes a flip top cap and is engineered to maintain proper coolant levels without pressurization.

  • Constructed from durable white plastic for corrosion resistance
  • Includes one flip top cap for easy access and secure sealing
  • Designed with one mounting hole for straightforward installation
  • Non-pressurized reservoir compatible with Ford Focus cooling systems
  • Package contains one coolant reservoir and one cap; mounting hardware not included

Detailed Product Description

The Dorman 603-340 engine coolant reservoir is a direct replacement part tailored for Ford Focus vehicles. Its white plastic construction ensures resistance to heat and corrosion, extending the life of your cooling system. The included flip top cap allows for convenient coolant level checks and refills without the need to remove the entire cap assembly. This reservoir is non-pressurized, matching the original equipment specifications for proper coolant expansion and contraction. With a single mounting hole, installation is straightforward, though mounting hardware is not included and may need to be reused or sourced separately.

Common Applications and Problem Resolution

  • Replacement for cracked or leaking coolant reservoirs in Ford Focus models
  • Solves coolant overflow or loss due to damaged or faulty reservoirs
  • Addresses coolant contamination caused by reservoir degradation
  • Prevents engine overheating by maintaining proper coolant levels
  • Restores proper coolant system function after reservoir cap failure

Installation Notes and Tips

When installing the Dorman 603-340 coolant reservoir on your Ford Focus, ensure the mounting hole aligns correctly with the vehicle’s bracket. Since mounting hardware is not included, retain original fasteners or acquire compatible hardware before installation. Check the flip top cap for a secure fit to prevent coolant leaks. It is recommended to drain the cooling system partially before removal to avoid spills. After installation, refill the reservoir with the appropriate coolant and bleed the system to remove air pockets.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 603-340 engine coolant reservoir undergoes quality inspections to ensure durability and performance in Ford Focus vehicles. 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.

BrandDorman
Part Number603-340
Cap IncludedYes
Cap TypeFlip Top
ColorWhite
MaterialPlastic
Mounting Brackets IncludedNo
Mounting Hardware IncludedNo
Mounting Hole Quantity1
Package Contents1 Coolant Reservoir; 1 Cap
PressurizedNo

This part fits 4 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
2011FordFocus2.0LL4Front
2010FordFocus2.0LL4Front
2009FordFocus2.0LL4Front
2008FordFocus2.0LL4Front

* 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:

8S4Z8100BFRT1529CFRT1541C

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