my BMW 3 Series F30/F31 (2012-2019) has coolant leaking what should I check

Solution

1. Preparation

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

2. Inspect and Replace Hoses

• Tools Required: Hose clamp pliers, screwdriver, coolant catch pan.
• Sub-steps:
  1. Use hose clamp pliers to loosen the clamps on the hoses.
  2. Remove the hoses from the reservoir and radiator.
  3. Inspect the hoses for cracks and replace if necessary.
  4. Reinstall new hoses and secure with clamps.

3. Replace the Water Pump (if necessary)

• Tools Required: Socket set, torque wrench, gasket scraper.
• Sub-steps:
  1. Drain the coolant into a catch pan.
  2. Remove the serpentine belt from the water pump.
  3. Unbolt and remove the water pump from the engine.
  4. Clean the mounting surface with a gasket scraper.
  5. Install the new water pump, ensuring a new gasket is used.
  6. Tighten bolts to the manufacturer's specified torque.

4. Check and Replace the Radiator (if needed)

• Tools Required: Socket set, coolant catch pan.
• Sub-steps:
  1. Drain the coolant from the radiator.
  2. Disconnect the upper and lower radiator hoses.
  3. Remove any mounting brackets and electrical connections.
  4. Carefully lift the radiator out of the engine bay.
  5. Install the new radiator and reconnect all hoses and connections.

5. Refill Coolant

• Tools Required: Funnel, coolant.
• Sub-steps:
  1. Refill the coolant reservoir with the appropriate coolant mixture.
  2. Start the engine and let it run to circulate the coolant.
  3. Check for leaks around the replaced components.