Skoda Octavia NFL (2020-Present) overheating when idling what could be wrong

Solution

1. Preparation

• Gather tools and parts required for repairs.
• Ensure the engine is cool to prevent burns.
• Disconnect the battery to avoid electrical issues.

2. Inspect and Replace Thermostat

• Remove the thermostat housing using a socket set.
  • Tools Required: Socket set, wrench.
• Remove the old thermostat and inspect it for proper operation.
• Install a new thermostat, ensuring the correct orientation.
  • Torque the housing bolts to manufacturer's specifications (typically around 10-12 Nm).

3. Flush and Refill Cooling System

• Drain the coolant from the radiator and engine block using a drain pan.
  • Tools Required: Drain pan, socket set.
• Flush the cooling system with a coolant flush solution.
• Refill with the manufacturer's recommended coolant mixture (typically a 50/50 mix of antifreeze and distilled water).
• Bleed the cooling system to remove air pockets by running the engine with the radiator cap off until the thermostat opens.

4. Inspect and Replace Radiator Fan (if necessary)

• Check fan operation by connecting the battery directly to the fan motor.
• If the fan does not operate, remove it from the vehicle.
  • Tools Required: Socket set, wiring connectors.
• Install a new radiator fan if the original is defective.

5. Repair any Cooling System Leaks

• Inspect all hoses and connections for wear or damage.
• Replace any faulty hoses with new ones, ensuring tight and secure connections.