For a Ford Focus, use Motorcraft Premium Gold Engine Coolant, or any coolant that meets Ford specification WSS-M97B44-D (or the newer WSS-M97B44-D2). It is typically sold as a 50/50 premixed solution and is designed to work with Ford’s cooling system.
In more detail, the Ford Focus requires a long-life, silicate-free coolant that protects the engine and cooling components across a wide temperature range. Always verify the exact specification for your model year and market in the owner’s manual or with a dealer. Do not mix coolants that aren’t Ford-approved or that don’t meet WSS-M97B44-D (or D2), as improper mixtures can reduce cooling efficiency and risk corrosion or gasket damage. Some regions or older models may reference slightly different wording, but the core requirement remains: Ford-approved coolant that meets the WSS-M97B44-D or WSS-M97B44-D2 specification.
Coolant options that meet Ford specifications
Below are the coolant options that are compatible with Ford Focus models when they explicitly meet Ford’s specification. Check the label to confirm WSS-M97B44-D or WSS-M97B44-D2 and that the product is silicate-free and designed for long-life use.
- Motorcraft Premium Gold Engine Coolant (50/50 premixed). Meets Ford WSS-M97B44-D (and WSS-M97B44-D2).
- Any brand coolant that explicitly lists Ford WSS-M97B44-D or WSS-M97B44-D2 on the label and is silicate-free, designed for long-life use.
Choosing a Ford-approved coolant helps ensure compatibility with the Focus’s radiator, hoses, and radiator cap, while providing the corrosion protection needed for the cooling system’s longevity.
How to flush and refill the cooling system
If you’re flushing or replacing the coolant, follow these steps to minimize air pockets and ensure proper coolant levels. Work on a completely cool engine and plan for proper disposal of old coolant. The steps below outline a standard drain-and-fill procedure and may vary by model year.
- Prepare: Gather Ford-approved coolant (Motorcraft Premium Gold or equivalent meeting WSS-M97B44-D/D2), distilled water if using concentrate, a drain pan, rags, and the appropriate tools.
- Drain old coolant: Place the drain pan under the radiator drain and open the radiator and engine block drains to empty the system.
- Flush (optional but recommended): Use a cooling-system flush product or distilled water to rinse passages until the effluent runs clear.
- Refill: Close drains, then add a 50/50 mix of coolant and distilled water (or use premixed coolant as directed by Ford). Do not use tap water.
- Bleed air and check level: Start the engine with the radiator cap off and the heater set to maximum heat, running until the thermostat opens. Top off coolant to the correct level and reinstall the radiator cap.
- Check for leaks and test: Inspect hoses and hoses clamps for leaks, then recheck the coolant level after the engine has cooled.
Bleeding the cooling system is important in a Focus, as air pockets can cause overheating or hot spots if not properly expelled.
Tips and cautions
Always avoid mixing Dex-Cool (GM) or other non-Ford coolants with Ford-spec coolant, and never use products that don’t meet WSS-M97B44-D or D2. If you’re unsure about the exact specification for your Focus’s year or market, consult the owner’s manual or a dealership. While coolant color can vary by brand, the critical factor is meeting Ford’s specification rather than color alone.
Summary
For a Ford Focus, the recommended coolant is Motorcraft Premium Gold Engine Coolant or any equivalent that meets Ford spec WSS-M97B44-D (or WSS-M97B44-D2). Use a 50/50 premixed solution or mix concentrate with distilled water, and follow proper draining, flushing, and bleeding procedures to maintain optimal cooling system performance. Always verify the exact specification for your model year and market in the owner’s manual or with a dealer.