how to check for coolant leaks in my Volkswagen Golf MK7 (2015-2019)

Solution

1. Preparation

• Gather tools and materials.
• Tools Required:
  • Pliers
  • Screwdrivers
  • UV dye and UV light (if using dye test)
  • Cooling system pressure tester
  • Clean rags
• Ensure the engine is cool before starting.

2. Visual Inspection

• Coolant Reservoir:

  • Remove the coolant reservoir cap.
  • Inspect for cracks or leaks.
  • Clean around the cap to prevent contamination before removal.

• Hoses:

  • Check all coolant hoses for any signs of wear or leaks.
  • Squeeze the hoses to determine if they feel soft or brittle.
  • Look for wet spots or crusty residue around hose connections.

3. Inspect Engine Components

• Water Pump:

  • Locate the water pump and check for any signs of leakage around the pump housing.
  • Look for wetness or coolant residue around the pump shaft.

• Engine Block and Cylinder Head:

  • Inspect the engine block and cylinder head for visible leaks or stains.
  • Clean the area with a rag and monitor for fresh leaks.

4. Conducting a Pressure Test

• Attach the cooling system pressure tester to the radiator or expansion tank.
• Pump the tester to the specified pressure (usually 15-20 psi).
• Observe the pressure gauge for any drop over time, indicating a leak.
• Listen for hissing sounds that indicate escaping coolant.

5. UV Dye Test (if necessary)

• Add UV dye to the coolant.
• Run the engine to circulate the dye.
• Use a UV light to inspect for fluorescent signs of coolant leaks.