OE Quality
60-Day Returns

Dorman 603-234 Engine Coolant Reservoir - Front
Overview of Dorman Engine Coolant Reservoir 603-234
The Dorman 603-234 engine coolant reservoir is designed for reliable coolant storage and overflow management in select Mitsubishi vehicles. This replacement reservoir is compatible with Mitsubishi Lancer, Outlander, Outlander Sport, and RVR models, providing a precise fit and durable construction.
- Constructed from durable white plastic for corrosion resistance
- Includes a flip-top cap for easy access and secure sealing
- Non-pressurized design suitable for overflow coolant containment
- Comes with one mounting hole for straightforward installation
- Cap included with the reservoir for complete replacement
Detailed Product Description
The Dorman 603-234 engine coolant reservoir is made from high-quality plastic, ensuring resistance to heat and chemical exposure common in engine compartments. Its white color allows for easy coolant level monitoring without removing the cap. The flip-top cap design facilitates convenient refilling and inspection while maintaining a secure seal to prevent leaks. This reservoir is non-pressurized, making it ideal for managing coolant overflow rather than pressurized coolant circulation. The single mounting hole allows for proper alignment and secure attachment in the engine bay. This product includes both the reservoir and the cap, providing a complete solution for coolant overflow system maintenance.
Compatible Vehicles and Applications
- Compatible with Mitsubishi Lancer models requiring a replacement coolant reservoir
- Fits Mitsubishi Outlander and Outlander Sport vehicles for proper coolant overflow management
- Suitable for Mitsubishi RVR models needing a direct-fit coolant reservoir replacement
Common Issues Addressed by This Coolant Reservoir
- Cracked or leaking coolant reservoir causing coolant loss
- Damaged or missing reservoir cap leading to coolant contamination
- Discolored or brittle plastic reservoir affecting coolant visibility and integrity
- Coolant overflow system malfunction due to faulty reservoir
- Replacement needed after overheating or engine coolant system repairs
Installation Notes and Tips
Installation of the Dorman 603-234 reservoir requires removal of the old reservoir and proper alignment using the single mounting hole. Since mounting hardware is not included, reuse existing brackets and fasteners or acquire compatible hardware separately. Ensure the flip-top cap is securely fastened after installation to prevent leaks. Check coolant levels and top off as necessary after installation. It is recommended to inspect hoses and connections for wear during replacement.
Quality Assurance and Warranty
Dorman parts are manufactured to meet or exceed OEM specifications for fit and function. The 603-234 engine coolant reservoir undergoes quality checks to ensure durability and performance. While specific warranty details are not provided here, Dorman typically offers limited warranties covering defects in material and workmanship. Consult product documentation or the manufacturer for exact warranty terms.
| Brand | Dorman |
| Part Number | 603-234 |
| Material | Plastic |
| Color | White |
| Mounting Hardware Included | No |
| Mounting Hole Quantity | 1 |
| Mounting Brackets Included | No |
| Cap Type | Flip top |
| Pressurized | No |
| Cap Included | Yes |
| Package Contents | 1 coolant reservoir; 1 cap |
This part fits 60 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2020 | Mitsubishi | Outlander Sport | 2.4L | L4 | N/A | |
| 2020 | Mitsubishi | RVR | 2.0L | L4 | N/A | |
| 2019 | Mitsubishi | Outlander Sport | 2.4L | L4 | N/A | |
| 2019 | Mitsubishi | RVR | 2.4L | L4 | N/A | |
| 2018 | Mitsubishi | Outlander Sport | 2.4L | L4 | Front | |
| 2018 | Mitsubishi | Outlander Sport | 2.0L | L4 | Front | |
| 2018 | Mitsubishi | RVR | 2.4L | L4 | Front | |
| 2018 | Mitsubishi | RVR | 2.0L | L4 | Front | |
| 2017 | Mitsubishi | Lancer | 2.4L | L4 | Front | |
| 2017 | Mitsubishi | Lancer | 2.0L | L4 | Front | |
| 2017 | Mitsubishi | Outlander Sport | 2.4L | L4 | Front | |
| 2017 | Mitsubishi | Outlander Sport | 2.0L | L4 | Front | |
| 2017 | Mitsubishi | RVR | 2.4L | L4 | Front | |
| 2017 | Mitsubishi | RVR | 2.0L | L4 | Front | |
| 2016 | Mitsubishi | Lancer | 2.4L | L4 | Front | |
| 2016 | Mitsubishi | Lancer | 2.0L | L4 | Front | |
| 2016 | Mitsubishi | Outlander Sport | 2.4L | L4 | Front | |
| 2016 | Mitsubishi | Outlander Sport | 2.0L | L4 | Front | |
| 2016 | Mitsubishi | RVR | 2.4L | L4 | Front | |
| 2016 | Mitsubishi | RVR | 2.0L | L4 | Front | |
| 2015 | Mitsubishi | Lancer | 2.4L | L4 | Front | |
| 2015 | Mitsubishi | Lancer | 2.0L | L4 | Front | |
| 2015 | Mitsubishi | Outlander Sport | 2.4L | L4 | Front | |
| 2015 | Mitsubishi | Outlander Sport | 2.0L | L4 | Front | |
| 2015 | Mitsubishi | RVR | 2.4L | L4 | Front | |
| 2015 | Mitsubishi | RVR | 2.0L | L4 | Front | |
| 2014 | Mitsubishi | Lancer | 2.4L | L4 | Front | |
| 2014 | Mitsubishi | Lancer | 2.0L | L4 | Front | |
| 2014 | Mitsubishi | Outlander Sport | 2.0L | L4 | Front | |
| 2014 | Mitsubishi | RVR | 2.0L | L4 | Front | |
| 2013 | Mitsubishi | Lancer | 2.4L | L4 | Front | |
| 2013 | Mitsubishi | Lancer | 2.0L | L4 | Front | |
| 2013 | Mitsubishi | Outlander | 2.4L | L4 | Front | |
| 2013 | Mitsubishi | Outlander | 3.0L | V6 | Front | |
| 2013 | Mitsubishi | Outlander Sport | 2.0L | L4 | Front | |
| 2013 | Mitsubishi | RVR | 2.0L | L4 | Front | |
| 2012 | Mitsubishi | Lancer | 2.4L | L4 | Front | |
| 2012 | Mitsubishi | Lancer | 2.0L | L4 | Front | |
| 2012 | Mitsubishi | Outlander | 2.4L | L4 | Front | |
| 2012 | Mitsubishi | Outlander | 3.0L | V6 | Front | |
| 2012 | Mitsubishi | Outlander Sport | 2.0L | L4 | Front | |
| 2012 | Mitsubishi | RVR | 2.0L | L4 | Front | |
| 2011 | Mitsubishi | Lancer | 2.4L | L4 | Front | |
| 2011 | Mitsubishi | Lancer | 2.0L | L4 | Front | |
| 2011 | Mitsubishi | Outlander | 2.4L | L4 | Front | |
| 2011 | Mitsubishi | Outlander | 3.0L | V6 | Front | |
| 2011 | Mitsubishi | Outlander Sport | 2.0L | L4 | Front | |
| 2011 | Mitsubishi | RVR | 2.0L | L4 | Front | |
| 2010 | Mitsubishi | Lancer | 2.4L | L4 | Front | |
| 2010 | Mitsubishi | Lancer | 2.0L | L4 | Front | |
| 2010 | Mitsubishi | Outlander | 2.4L | L4 | Front | |
| 2010 | Mitsubishi | Outlander | 3.0L | V6 | Front | |
| 2009 | Mitsubishi | Lancer | 2.4L | L4 | Front | |
| 2009 | Mitsubishi | Lancer | 2.0L | L4 | Front | |
| 2009 | Mitsubishi | Outlander | 2.4L | L4 | Front | |
| 2009 | Mitsubishi | Outlander | 3.0L | V6 | Front | |
| 2008 | Mitsubishi | Lancer | 2.0L | L4 | Front | |
| 2008 | Mitsubishi | Outlander | 2.4L | L4 | Front | |
| 2008 | Mitsubishi | Outlander | 3.0L | V6 | Front | |
| 2007 | Mitsubishi | Outlander | 3.0L | V6 | Front |
* 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:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.