why does my Toyota Highlander XU70 (2020-Present) have a coolant leak

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, coolant pressure tester, rags, safety goggles, gloves
• Allow the engine to cool completely before beginning work.
• Disconnect the negative battery terminal to prevent electrical issues.

2. Locate and Identify the Leak

• Use the coolant pressure tester to pressurize the cooling system.
• Observe for any coolant escape points while under pressure to pinpoint the leak's source.

3. Replace Damaged Components

• If the radiator is leaking:

  1. Remove the radiator hoses using a socket set.
  2. Unbolt the radiator from its mounts and remove it from the vehicle.
  3. Install the new radiator by reversing the removal steps, ensuring to use new clamps for hoses.
  4. Fill the system with the recommended type of coolant (Toyota Super Long Life Coolant).

• If hoses are leaking:

  1. Remove the damaged hose clamps.
  2. Slide off the damaged hose and replace it with a new one.
  3. Reattach the hose clamps securely.

• If the water pump is leaking:

  1. Remove the drive belt using the appropriate tools.
  2. Unbolt and remove the old water pump.
  3. Clean the mounting surface on the engine and install a new pump with a new gasket.
  4. Reinstall the drive belt.

4. Refill and Bleed the Cooling System

1. Fill the coolant reservoir with the appropriate coolant.
2. Start the engine with the radiator cap off, allowing air to escape.
3. Once the engine reaches operating temperature and the thermostat opens, top off the coolant level and replace the radiator cap.