what does it mean when my BMW 3 Series G20/G21 (2019-2024) has a coolant leak?

Solution

1. Preparation

• Gather tools and safety equipment: gloves, safety glasses, coolant, funnel, and a pressure tester.
• Ensure the engine is cool to prevent burns.
• Disconnect the battery to avoid electrical issues.

2. Locate the Leak

• Use a pressure tester to pressurize the cooling system.
• Observe areas where coolant seeps or drips to pinpoint the source of the leak.

3. Replace Damaged Components

• Hoses:
  • If a hose is cracked or worn, loosen the clamps at both ends and remove the hose.
  • Install the new hose and secure it with clamps, ensuring they are tightened to the manufacturer's torque specifications.
• Radiator:
  • If the radiator is leaking, drain the coolant using a catch pan.
  • Remove the upper and lower radiator hoses, disconnect any electrical connectors, and remove mounting bolts.
  • Install the new radiator, reattach hoses, and secure with bolts.

4. Refill the Cooling System

• Use a funnel to refill the coolant reservoir with the appropriate type of coolant specified in the owner's manual.
• Start the engine and run it until it reaches operating temperature, checking for leaks around the repaired areas.

5. Final Checks

• Inspect all connections and hoses to ensure they are secure.
• Recheck coolant levels after the engine has cooled down and top off if necessary.