The 2019 Ford Fiesta should use Ford Motorcraft coolant that meets Ford specification WSS-M97B44-D2, available as either a 50/50 premixed solution or a concentrated formula you mix with distilled water.
Understanding the specification and why it matters
Ford designs its cooling system around specific ethylene glycol-based formulations that resist corrosion and provide long-term protection. For the Fiesta, the recommended option is Motorcraft Gold/Extended Life coolant that complies with Ford’s WSS-M97B44-D2 standard. Using a coolant that does not meet Ford’s specification can lead to cooling-system problems, including corrosion or improper heat transfer.
Owners should look for coolant products labeled as Motorcraft Premium Gold or Motorcraft Gold and verify compatibility with Ford’s specification on the product packaging or data sheet. If you’re unsure, consult a Ford dealer or a qualified mechanic to confirm the correct specification for your vehicle’s engine and production date.
Before selecting a coolant, it’s helpful to know the approved options and how to apply them correctly. The following list outlines the typical choices and key considerations.
Approved options and guidelines for the 2019 Fiesta
- Motorcraft Premium Gold Engine Coolant (Concentrate) that meets Ford specification WSS-M97B44-D2; mix with distilled water to achieve a 50/50 coolant mix as directed by the product instructions.
- Motorcraft Premium Gold Engine Coolant (50/50 Premixed) ready to use, labeled to meet Ford specification WSS-M97B44-D2.
- Any aftermarket coolant that explicitly states compatibility with Ford WSS-M97B44-D2 (or the equivalent Ford specification for your market) and is ethylene glycol-based with a compatible silicate-free formulation. Always verify labeling and avoid mixing with unrelated coolant types.
When shopping for coolant, confirm the product explicitly lists Ford WSS-M97B44-D2 on its label or datasheet. If in doubt, choose the OEM option to simplify maintenance and reduce the risk of incompatibility.
Concluding note: The safest path is to use OEM Ford Motorcraft coolant or an aftermarket coolant that clearly carries the Ford specification. Do not mix wildly different coolant chemistries, and follow the mixing instructions exactly if you’re using a concentrate.
Maintenance steps for adding or replacing coolant
- Ensure the engine is cool before opening the cooling system to avoid scalding from pressurized coolant.
- Determine whether you are using a concentrate (50/50 mix) or a premixed version, and prepare accordingly according to the product instructions.
- When adding coolant, use the correct ratio and pour slowly to avoid air pockets; check the reservoir level and top up as needed.
- If performing a full coolant flush, follow proper draining and refilling steps, ensuring all air is purged and the system is leak-free after running the engine to operating temperature.
Tip: Always refer to the owner’s manual for vehicle-specific intervals and procedures, and if you’re unsure, have a professional perform the service to ensure proper protection and cooling system longevity.
Summary
For the 2019 Ford Fiesta, use Ford Motorcraft coolant that meets WSS-M97B44-D2, available as either a 50/50 premixed or a concentrate. Choose OEM or Ford-validated aftermarket products, verify labeling, and avoid mixing incompatible coolants. Following the correct specification helps protect the engine from corrosion and maintains optimal cooling performance.