how to stop my Volkswagen Passat B8 (2015-2022) from overheating?

Solution

1. Preparation

• Gather necessary tools and parts.
• Allow the engine to cool completely before starting work.
• Disconnect the battery to ensure safety.

2. Inspect and Replace Coolant

• Sub-steps:
  • Remove the coolant reservoir cap.
  • Drain the old coolant using a catch pan.
  • Flush the cooling system with water to remove debris.
  • Refill the system with the recommended coolant type (G13 for Volkswagen).

3. Thermostat Replacement

• Sub-steps:
  • Locate the thermostat housing, typically at the engine end of the upper radiator hose.
  • Remove the bolts securing the housing using a socket set (torque to manufacturer specs upon reassembly).
  • Remove the old thermostat and gasket.
  • Install the new thermostat and gasket.
  • Reassemble the housing and tighten bolts to specified torque.

4. Radiator and Cooling Fan Check

• Sub-steps:
  • Remove any obstructions around the radiator.
  • Inspect the radiator fins for damage and clean them if blocked.
  • Test the cooling fan operation by turning on the engine and letting it reach operating temperature. Ensure fans engage when needed.
  • Replace any faulty fans or relays as necessary.

5. Final Assembly and Testing

• Sub-steps:
  • Reconnect the battery.
  • Start the engine and let it idle, monitoring the temperature gauge.
  • Check for leaks around the thermostat and radiator.
  • Take the vehicle for a test drive, observing for any overheating signs.