why does my Volkswagen Golf MK7 (2015-2019) keep losing coolant?

Solution

1. Preparation

• Gather tools and parts.
• Tools Required: Socket set, torque wrench, coolant pressure tester, flashlight, funnel.
• Parts Required: New coolant (G12 or G13), replacement hoses (if damaged), water pump (if faulty), radiator (if damaged), head gasket (if blown).

2. Inspect and Replace Faulty Components

2.1. Replace Damaged Hoses

• Disconnect the battery to ensure safety.
• Use a socket set to remove any clamps securing the hoses.
• Remove the damaged hose and replace it with a new one.
• Reattach clamps and ensure a tight fit.

2.2. Water Pump Replacement (if necessary)

• Drain the coolant from the system.
• Disconnect the negative battery terminal.
• Remove any components obstructing access to the water pump (e.g., timing belt cover).
• Use a socket set to remove the old water pump.
• Clean the mounting surface and install the new water pump using new gaskets.
• Torque the bolts to manufacturer specifications.

2.3. Radiator Replacement (if necessary)

• Drain the coolant and remove the upper and lower radiator hoses.
• Disconnect any electrical connections (fans, sensors) from the radiator.
• Remove the mounting bolts or clips securing the radiator in place.
• Carefully lift out the old radiator and install the new one.
• Reconnect hoses and electrical connections.

3. Refill and Bleed the Cooling System

• Refill the coolant reservoir with the appropriate coolant mixture.
• Start the engine and let it reach operating temperature.
• Open the bleed valve (if equipped) to allow trapped air to escape.
• Close the bleed valve once coolant flows steadily.
• Check for leaks around the replaced components.