OE Quality
60-Day Returns

Dorman 603-352 Hybrid Vehicle Motor / Electronics Coolant Reservoir
Overview of Dorman Hybrid Vehicle Coolant Reservoir
The Dorman 603-352 Hybrid Vehicle Motor / Electronics Coolant Reservoir is designed specifically for select Ford, Lincoln, and Mercury models. This coolant reservoir is engineered to meet the cooling system needs of hybrid vehicles like the Ford Fusion, Lincoln MKZ, and Mercury Milan, ensuring reliable performance and proper coolant management.
- Constructed from durable plastic material for long-lasting use
- Capacity of 1 quart to support hybrid vehicle cooling demands
- Dimensions: 9.5 inches length, 6.5 inches width, and 7 inches height
- White color with clear indicator markings for easy coolant level monitoring
- Includes filler neck cap with a 1.375-inch inside diameter
- Specific fit for Ford Fusion, Lincoln MKZ, and Mercury Milan models
- Two mounting holes for secure installation (mounting hardware not included)
- One outlet port and no inlet ports, designed for hybrid motor/electronics cooling systems
- Package includes one coolant reservoir and one reservoir cap
Detailed Product Description
The Dorman 603-352 coolant reservoir is a replacement part tailored for hybrid vehicle motor and electronics cooling systems. Made from sturdy plastic with a material thickness of 4 millimeters, this reservoir is built to withstand the thermal and pressure demands of hybrid powertrain cooling. Its white color and clear indicator markings allow for quick visual checks of coolant levels, helping maintain optimal system performance. The reservoir measures 9.5 inches in length, 6.5 inches in width, and 7 inches in height, providing a compact yet sufficient capacity of 1 quart. The filler neck inside diameter of 1.375 inches accommodates the included reservoir cap, ensuring a secure seal. Designed specifically for the Ford Fusion, Lincoln MKZ, and Mercury Milan, this reservoir features two mounting holes for a stable fit, although mounting hardware is not included.
Common Applications and Issues Addressed
- Replacement of cracked or leaking hybrid vehicle coolant reservoirs
- Resolving coolant level inconsistencies in Ford Fusion, Lincoln MKZ, and Mercury Milan hybrids
- Preventing overheating caused by coolant loss in hybrid motor/electronics cooling systems
- Addressing reservoir cap failures that lead to coolant evaporation or contamination
- Upgrading worn or discolored reservoirs to maintain system integrity
Installation Notes and Tips
- Ensure vehicle compatibility with Ford Fusion, Lincoln MKZ, or Mercury Milan hybrid models before installation
- Drain the cooling system properly to avoid spills during reservoir replacement
- Use existing mounting hardware or source appropriate fasteners as they are not included
- Check hoses and connections for wear or damage and replace if necessary
- After installation, refill coolant to the recommended level and inspect for leaks
Quality Assurance and Warranty
Dorman parts are manufactured to meet or exceed OEM specifications, providing reliable performance for hybrid vehicle cooling systems. The 603-352 coolant reservoir undergoes quality checks to ensure durability and fitment accuracy. 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.
| Brand | Dorman |
| Part Number | 603-352 |
| Capacity | 1 |
| Color | White |
| Filler Neck Cap Included | Yes |
| Filler Neck Inside Diameter | 1.375 |
| Height | 7 |
| Hoses Attached | No |
| Indicator Markings | Yes |
| Indicator Markings Color | Clear |
| Inlet Port Quantity | 0 |
| Length | 9.5 |
| Material | Plastic |
| Material Thickness | 4 |
| Mounting Hardware Included | No |
| Mounting Hole Quantity | 2 |
| Outlet Port Quantity | 1 |
| Package Contents | 1 Coolant Reservoir; 1 Reservoir Cap |
| Universal Or Specific Fit | Specific |
| Width | 6.5 |
This part fits 7 vehicles. Search below:
| Year | Make | Model | Submodel | Position | Notes |
|---|---|---|---|---|---|
| 2012 | Ford | Fusion | Hybrid | N/A | |
| 2012 | Lincoln | MKZ | Hybrid | N/A | |
| 2011 | Ford | Fusion | Hybrid | N/A | |
| 2011 | Lincoln | MKZ | Hybrid | N/A | |
| 2011 | Mercury | Milan | Hybrid | N/A | |
| 2010 | Ford | Fusion | Hybrid | N/A | |
| 2010 | Mercury | Milan | Hybrid | N/A |
* 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.