why does my Toyota Highlander Third Generation (2014-2019) engine overheat in traffic

Solution

1. Preparation

• Ensure the engine is cool to avoid burns.
• Gather tools and parts needed for the repair.

2. Coolant Level Check and Refill

• Open the hood and locate the coolant reservoir.
• If low, add the recommended coolant type until it reaches the full line.
• Tools Required: Funnel, coolant.

3. Inspect and Replace the Thermostat

• Remove the thermostat housing by loosening the bolts with a socket set.
• Remove the old thermostat and inspect for damage or blockage.
• Install a new thermostat (ensure it is the correct type for the Highlander).
• Reattach the housing and torque bolts to manufacturer specifications.
• Tools Required: Socket set, torque wrench.
• Safety Warnings: Ensure the engine is completely cool before working on the cooling system.

4. Check and Replace the Radiator Fan

• Test the fan by turning on the engine and observing if it activates when the engine reaches operating temperature.
• If not operational, remove the fan assembly by disconnecting electrical connectors and loosening mounting bolts.
• Install a new fan assembly.
• Tools Required: Socket set, multimeter (for testing).

5. Inspect and Repair Coolant Leaks

• Inspect hoses, the radiator, and the water pump for signs of leaks.
• Replace any damaged hoses or components as necessary.
• Tools Required: Pliers, socket set.

6. Bleed the Cooling System

• After repairs, run the engine with the radiator cap off until the thermostat opens.
• Fill the radiator to the recommended level and replace the cap.
• Drive the vehicle to ensure proper functionality.
• Tools Required: Funnel.