Volkswagen Golf MK7 (2015-2019) overheating issues, how to troubleshoot?

Solution

1. Preparation

• Gather tools such as a socket set, screwdrivers, OBD-II scanner, and a multimeter.
• Ensure the engine is cool before starting any work to prevent burns.
• Disconnect the negative terminal of the battery.

2. Replace Thermostat (if faulty)

1. Drain the coolant from the system into a clean container using a drain pan.
2. Locate the thermostat housing, typically near the engine block.
3. Remove the bolts securing the thermostat housing using the appropriate socket size.
4. Carefully separate the housing from the engine, ensuring to collect any remaining coolant.
5. Replace the old thermostat with a new one, ensuring the correct orientation (usually marked).
6. Reinstall the thermostat housing and tighten the bolts to the manufacturer's specifications (typically around 10 Nm).
7. Refill the cooling system with the correct type of coolant as specified in the owner’s manual.

3. Inspect Water Pump

1. Remove any components obstructing access to the water pump, such as the drive belt or timing belt cover.
2. Visually inspect the water pump for leaks or signs of wear. Listen for unusual noises when the engine is running.
3. If replacement is necessary, remove the water pump by unbolting it from the engine block.
4. Clean the mounting surface on the engine to ensure a proper seal for the new pump.
5. Install the new water pump, following the manufacturer's torque specifications (typically around 25 Nm).
6. Reassemble any removed components, ensuring to reinstall the drive belt correctly.