what causes my Toyota Highlander XU70 (2020-Present) to overheat while driving

Solution

1. Preparation

• Tools Required:
  • Socket set
  • Screwdrivers
  • Pliers
  • OBD-II scanner
  • Coolant catch pan
• Safety Warnings:
  • Allow the engine to cool completely before opening the hood or inspecting the cooling system.
  • Wear gloves and safety glasses.

2. Replace Low Coolant Level

1. If coolant is low, refill it with the manufacturer-recommended coolant type.
2. Start the engine and allow it to reach operating temperature.
3. Check for leaks again after the engine has run.

3. Replace Damaged Hoses or Components

1. Identify and remove any damaged hoses using a socket set and pliers.
2. Install new hoses, ensuring all connections are secure.
3. Refill the coolant system after replacing hoses.

4. Replace Thermostat

1. Drain the coolant from the radiator into a catch pan.
2. Remove the thermostat housing bolts and lift off the housing.
3. Replace the old thermostat with a new one, ensuring it is oriented correctly.
4. Reassemble the housing and refill the coolant.

5. Repair or Replace Radiator Fan

1. Disconnect the battery to ensure safety.
2. Remove any components obstructing access to the radiator fan.
3. Test the fan directly by connecting it to a power source; replace if it does not operate.
4. Reinstall the fan and reattach any components removed during access.