Finding the Coolant Location in a 2017 Ford Fusion Hybrid: A Step-by-Step Guide

By Nick Marchenko, PhD

The Ford Fusion Hybrid has two separate cooling systems: one for the engine and another for the inverter system controller, unique to the hybrid system. It's important to understand that these systems, while operating similarly, have different requirements.

Safety First: Checking the Coolant

Warning: Always ensure the engine is cool before you start. The cooling system is under pressure, and steam or hot liquid can cause injury.

Locating the Coolant Reservoir:

The coolant reservoir in the Ford Fusion Hybrid is usually located near the front of the engine compartment. It's a translucent container with markings for minimum and maximum levels.

Checking Coolant Levels:

When the engine is cold, check the coolant level. It should be between the MIN and MAX marks on the reservoir. Note that coolant expands when hot, and it's normal for the level to rise above the MAX mark under these conditions.

Coolant Concentration:

It's crucial to maintain a coolant concentration of 48% to 50%. This concentration ensures a freezing point between -30°F and -34°F. Use a refractometer for accuracy, as hydrometers or coolant test strips are not recommended.

Adding Coolant

Warning: Never open the coolant reservoir cap while the engine is hot or running.

Unscrewing the Cap:

Turn the cap slowly to release any pressure.

Adding the Coolant:

Use only prediluted coolant approved for your vehicle (see your maintenance guide for specifications). If necessary, mix approved concentrated coolant with distilled water to a 50/50 ratio.

Filling to the Correct Level:

Add the coolant until it reaches the correct level. Do not overfill past the MAX mark.

Replacing the Cap:

Secure the cap by turning it clockwise until it's tightly closed.

Post-Addition Check:

After driving for a few times, recheck the coolant level and top up if necessary.

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Special Considerations

• Different Climates: In extremely cold climates, a concentration above 50% may be necessary. Conversely, in hot climates, reducing the concentration to 40% might be beneficial. However, never go below 40% or above 60%.
• Coolant Change Intervals: Refer to your vehicle's scheduled maintenance guide for when to change the coolant.
• Fail-Safe Cooling: If your engine overheats, the Fusion Hybrid may enter a fail-safe mode, reducing engine power. If this happens, stop as soon as it's safe and let the engine cool down before checking and adding coolant as necessary.

Additional Tips

• Avoid Mixtures and Additives: Do not mix different colors or types of coolant. Avoid additives or sealants that can harm your engine.
• Emergency Measures: In an emergency, you can add water to reach a service location, but this is a temporary solution. Have the system properly refilled with the right coolant as soon as possible.
• Environmental Considerations: Dispose of used coolant responsibly, following your community’s regulations.

By following these steps and guidelines, you can confidently locate and manage the coolant in your 2017 Ford Fusion Hybrid. Remember, regular checks and maintenance can prevent many common vehicle problems.

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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