why does my Toyota RAV4 XA50 (2019-2024) coolant overflow when parked

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the engine is cool before starting work.
• Disconnect the negative battery terminal for safety.

2. Inspect and Replace the Radiator Cap

• a. Remove the radiator cap using a towel (to protect from steam).
• b. Inspect the cap for any cracks, damage, or wear.
• c. If damaged, replace it with a new one that meets OEM specifications.

3. Repair or Replace Leaking Hoses or Components

• a. Identify any leaking hoses or components during inspection.
• b. For hoses, loosen the clamps with a screwdriver, remove the damaged hose, and install a new one.
• c. If the water pump or radiator is leaking, remove the necessary components (refer to the service manual for specific instructions).
• d. Replace the faulty component and ensure all connections are secure.

4. Check and Replace the Thermostat

• a. Drain the coolant into a clean container.
• b. Remove the thermostat housing bolts with a socket set.
• c. Take out the thermostat and inspect it for proper operation.
• d. Replace with a new thermostat if it does not open at the specified temperature.

5. Refill and Bleed the Cooling System

• a. Reconnect all hoses and components properly.
• b. Refill the radiator and reservoir with the appropriate coolant mixture.
• c. Start the engine and let it run until it reaches operating temperature.
• d. Monitor for air bubbles in the coolant and add coolant as necessary.