The Ultimate Guide to Choosing the Right Coolant Type for Your 2019 Ford Fusion Hybrid

By Nick Marchenko, PhD

The 2019 Ford Fusion Hybrid has two separate cooling systems. One is for the engine, and the other is for the inverter system controller, unique to the hybrid system. Both systems operate under different temperatures and pressures, which is vital to understand when choosing your coolant.

Checking the Engine Coolant

Before you begin, remember never to open the coolant reservoir when the engine is hot or running. Also, ensure that the coolant level is always between the MIN and MAX marks on the reservoir. The coolant in your Ford Fusion Hybrid should have a concentration of 48% to 50%, equating to a freeze point between -30°F (-34°C) and -34°F (-37°C).

Adding Coolant

It's crucial not to add engine coolant when the engine is hot. Use only prediluted coolant approved to the correct specification for your vehicle (Ford specification WSS-M97B44-D2). Avoid using non-specified additives, stop leak pellets, or cooling system sealants, as these can damage your cooling system. If prediluted coolant is not available, dilute approved concentrated coolant to a 50/50 ratio with distilled water.

Coolant Types

For the 2019 Ford Fusion Hybrid, the recommended coolant is the Motorcraft Orange Prediluted Antifreeze/Coolant (VC-3DIL-B in the U.S. and Mexico, CVC-3DIL-B in Canada). This specific type is formulated to work efficiently with your car's hybrid engine and inverter system.

Step-by-Step Guide to Adding Coolant

1. Cool Down: Ensure the engine is cool.
2. Open Cap: Unscrew the cap slowly to release any pressure.
3. Add Coolant: Pour the recommended prediluted coolant to the correct level.
4. Close Reservoir: Replace the cap and tighten it securely.
5. Check Regularly: Monitor the coolant level over the next few drives.

Special Considerations for Severe Climates

In extremely cold climates, you might need to increase the coolant concentration above 50%, but not exceeding 60%. In very hot climates, a concentration as low as 40% might be acceptable. However, remember that deviations from the 50/50 mix can affect the cooling efficiency and protection against corrosion.

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Coolant Change and Fail-Safe Cooling

Change your coolant at the intervals specified in the vehicle's maintenance schedule. In case of overheating, the Fusion Hybrid has a fail-safe cooling mode, reducing engine power to prevent damage. If this happens:

• Pull Over Safely: And switch off the engine.
• Cool Down: Allow the engine to cool before checking the coolant level.
• Restart Cautiously: Restart the engine when it's cool, but have the vehicle checked immediately.

Final Thoughts

Maintaining the right coolant level and type in your 2019 Ford Fusion Hybrid is crucial for your vehicle's performance and longevity. Remember, using the wrong coolant or improper maintenance can lead to severe engine damage. Always refer to your service guide for the most accurate and detailed information.

Nick Marchenko, PhD

Industrial Engineer & Automotive Content Specialist

Nick writes in-depth guides on car clubs, engine specs, vehicle ownership, and modifications, combining engineering knowledge with automotive passion.

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