why is my Ford Mustang S550 (2015-2023) losing coolant with no visible leaks

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the engine is cool before starting.
• Disconnect the battery to prevent electrical issues.

2. Perform a Pressure Test

• Tools Required: Coolant pressure tester.
• Attach the pressure tester to the coolant reservoir.
• Pump to the specified pressure (usually around 15-20 psi).
• Observe for pressure loss, indicating a leak.

3. Inspect Components

• Tools Required: Socket set, flashlight.
• Check the water pump and hoses for any signs of wear or leaks.
• Inspect the radiator for corrosion or damage. Replace if necessary.

4. Check for Internal Leaks

• Tools Required: Oil analysis kit.
• Remove the oil fill cap and check for a milky substance that indicates coolant in the oil.
• If contamination is present, a head gasket or internal component may have failed.

5. Replace Faulty Components

• If any leaks are identified, replace the corresponding parts (e.g., hoses, water pump, radiator).
• Ensure all connections are secure and properly tightened.

6. Refill Coolant

• Use manufacturer-recommended coolant type.
• Fill the system to the appropriate level and bleed any air from the system.