how to fix P0128 code in my Volvo XC60 Second Generation (2018-2024)

Learn how to diagnose and fix P0128 cooling system issue in Volvo XC60 (2018-2024). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface, and the engine is cool before starting work.
• Disconnect the battery to prevent electrical issues.

2. Inspect and Replace the Thermostat

1. Remove Components:

   • Remove any components obstructing access to the thermostat, such as the engine cover or air intake duct.
   • Tools Required: Socket set, pliers.

2. Drain Coolant:

   • Place a drain pan under the radiator. Open the drain valve and drain the coolant into the pan.
   • Tools Required: Drain pan.

3. Remove Thermostat Housing:

   • Locate the thermostat housing and remove the bolts securing it. Carefully pull off the housing.
   • Tools Required: Socket set, torque wrench.

4. Replace the Thermostat:

   • Remove the old thermostat and clean the surface of the housing and engine block.
   • Install the new thermostat in the correct orientation (usually with the spring side facing the engine).
   • Tools Required: Scraper for cleaning surfaces, new thermostat.

5. Reassemble:

   • Reattach the thermostat housing and tighten the bolts to the manufacturer's specified torque settings.
   • Reconnect any components removed earlier.

3. Refill the Cooling System

• Pour the appropriate type of coolant into the reservoir until full, ensuring no air pockets remain.
• Tools Required: Funnel.

4. Reconnect Battery

• Reconnect the battery terminals and ensure they are tight.

5. Test Run

• Start the engine and let it reach operating temperature while monitoring the temperature gauge and checking for leaks.