how to diagnose a coolant leak in my Volkswagen Golf MK7 (2015-2019)?

Solution

1. Preparation

• Tools Required:
  • Coolant system pressure tester
  • Socket set
  • Screwdriver set
  • Pliers
  • Drain pan
• Safety Warnings: Allow the engine to cool before starting work to prevent burns.

2. Isolate the Leak

• Sub-steps:
  1. If using a pressure tester, connect it to the coolant reservoir.
  2. Pump the tester to the recommended pressure (usually around 15-20 psi).
  3. Observe for any leaks; if coolant appears, you have isolated the leak.

3. Replace Faulty Components

• Sub-steps:
  1. For leaking hoses, remove the clamps with pliers and replace the hose.
  2. If the radiator is leaking, drain the coolant into the drain pan, disconnect all hoses, and remove the radiator.
  3. Install the new radiator and reconnect all hoses securely.
  4. For a faulty water pump, drain the coolant and remove the water pump by disconnecting the drive belt and bolts securing it.
  5. Install the new water pump and reseal with gasket material if required.

4. Refill Coolant

• Sub-steps:
  1. Refill the cooling system with the appropriate coolant type (usually G12 or G13 for VW).
  2. Run the engine with the radiator cap off to allow air to escape and top off as necessary.
  3. Replace the radiator cap securely.