Volkswagen Golf MK7 (2015-2019) overheating in stop and go traffic, what to do?

Solution

1. Preparation

• Gather tools and parts required for repair.
• Ensure the vehicle is parked on a level surface and the engine is turned off.
• Allow the engine to cool completely to avoid burns.

2. Coolant Check and Top-Up

• Sub-steps:
  • Open the coolant reservoir cap slowly to release any pressure.
  • Check the coolant level; if low, top up with the manufacturer-recommended coolant mixture (usually a 50/50 mix of antifreeze and distilled water).
  • Inspect for leaks around the reservoir and hoses.

3. Replace Thermostat (if faulty)

• Tools Required: Socket set, torque wrench, gasket scraper, new thermostat, replacement gasket.
• Sub-steps:
  • Drain the coolant into a clean container.
  • Remove the thermostat housing by unscrewing the bolts.
  • Take out the old thermostat and inspect the gasket. Clean the mating surfaces.
  • Install the new thermostat with the correct orientation and replace the gasket.
  • Reattach the thermostat housing and torque to specified values (consult the service manual for exact torque specs).
  • Refill the cooling system with the appropriate coolant mixture.

4. Inspect and Replace Cooling Fan (if malfunctioning)

• Tools Required: Multimeter, socket set.
• Sub-steps:
  • Disconnect the battery to prevent electrical shocks.
  • Remove the front grille or other components obstructing access to the cooling fan.
  • Test the fan motor using a multimeter for continuity. If faulty, replace with a new unit.
  • Reconnect all components and battery.

5. Water Pump Inspection and Replacement (if necessary)

• Tools Required: Socket set, coolant catch pan, gasket scraper, new water pump, replacement gasket.
• Sub-steps:
  • Drain the coolant from the system.
  • Remove any components obstructing access to the water pump (timing belt or serpentine belt if applicable).
  • Disconnect hoses and remove the water pump from its mounting.
  • Clean the mounting surface thoroughly.
  • Install the new water pump with the new gasket and secure it according to torque specifications.
  • Reinstall any removed components and refill the coolant.