why is my Toyota RAV4 heater blowing cold air when on

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the engine is cool to prevent burns.
• Disconnect the battery.

2. Inspect Coolant Levels

• Check the coolant reservoir and radiator cap.
  • If low, add the appropriate type of coolant (Toyota Long Life Coolant).
  • Ensure the engine is off and cool before removing the radiator cap.

3. Check for Leaks

• Visually inspect the radiator, hoses, and heater core for any signs of coolant leaks.
• Clean any spilled coolant to avoid slipping hazards.

4. Replace Thermostat (if faulty)

• Tools Required: Socket set, torque wrench, gasket scraper.
• Remove the thermostat housing by loosening the bolts, then carefully remove the old thermostat.
• Install the new thermostat, ensuring proper orientation.
• Reinstall the housing and torque bolts to manufacturer specifications.

5. Flush Heater Core

• Disconnect the heater core hoses from the engine.
• Use a garden hose to flush the heater core until clean water runs through.
• Reconnect the hoses securely and ensure there are no leaks.

6. Test Blend Door Actuator

• Remove the dashboard panel to access the blend door actuator.
• Inspect the actuator for proper operation by applying power directly.
• Replace if it does not function correctly.