how to fix coolant leak in my Volkswagen Passat B8 (2015-2022)?

Solution

1. Preparation

• Tools Required: Socket set, screwdrivers, pressure tester, coolant, rags.
• Ensure the engine is cool before starting work.
• Disconnect the battery to avoid electrical issues while working on the cooling system.

2. Identify the Leak Source

• Sub-steps:
  • Use the pressure tester to apply pressure to the cooling system.
  • Observe where the coolant is escaping, marking the area for repair.

3. Replace Damaged Components

• Sub-steps:
  • Hoses: If a hose is damaged, loosen the clamps and remove the old hose. Install a new hose, ensuring proper fitting and secure clamps. Torque the clamps to manufacturer's specifications.
  • Water Pump: If the water pump is leaking, remove the drive belt and unbolt the water pump. Clean the mounting surface and install a new water pump with a new gasket. Torque bolts to specification.
  • Radiator: If the radiator is damaged, drain the coolant from the system. Unbolt the radiator and disconnect the hoses. Install a new radiator and reconnect hoses, ensuring all connections are secure.

4. Refill and Bleed the Cooling System

• Sub-steps:
  • Refill the coolant reservoir with the appropriate type of coolant (check owner's manual for specifications).
  • Start the engine with the radiator cap off, and let it run until the thermostat opens, allowing coolant to circulate. This may require topping off the coolant as air escapes.

5. Final Inspection

• Check for leaks by inspecting the repaired areas and observing the coolant level after a short drive.