why does my Volkswagen Passat B8 (2015-2022) overheat during traffic?

Solution

1. Preparation

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

2. Coolant Level Check and Refill

• Open the coolant reservoir cap carefully to relieve any pressure.
• If low, add the appropriate type of coolant to the reservoir until it reaches the correct level.
• Check for leaks before proceeding.

3. Thermostat Replacement

• Tools Required: Socket set, torque wrench, gasket scraper.
• Locate the thermostat housing, which is typically near the engine block.
• Remove the bolts securing the thermostat housing and lift it off.
• Take out the old thermostat and replace it with a new one, ensuring the correct orientation.
• Clean the mating surfaces and apply a new gasket or sealant as necessary.
• Reattach the thermostat housing and torque bolts to the manufacturer’s specifications.

4. Radiator Fan Testing

• Reconnect the battery and start the engine.
• Allow the engine to reach operating temperature and observe if the radiator fan activates.
• If the fan does not turn on, replace the fan motor or check the fan relay and wiring for faults.

5. Radiator Inspection and Flush

• Inspect the radiator for any signs of damage or blockage.
• If clogged, perform a radiator flush using a radiator flush solution.
• Drain the old coolant, flush the system with water, and refill with new coolant.