how to fix my Toyota RAV4 heater that only blows cold air

Solution

1. Preparation

• Gather tools and parts.
• Ensure the engine is cool to avoid burns.
• Disconnect the battery.

2. Check Coolant Level

• Locate the coolant reservoir and remove the cap.
• If the coolant is low, add the recommended type of coolant (usually a 50/50 mix of water and antifreeze).

3. Inspect for Leaks

• Visually check hoses, the radiator, and the engine block for any signs of coolant leaks.
• If leaks are found, replace damaged hoses or components as necessary.

4. Replace Thermostat (if faulty)

• Remove the thermostat housing (typically requires a socket set).
• Take out the old thermostat and replace it with a new one, ensuring proper orientation.
• Reinstall the housing and torque to manufacturer specifications.

5. Flush Heater Core

• Disconnect the inlet and outlet hoses from the heater core.
• Using a garden hose, flush the heater core in both directions until clear water flows out.
• Reconnect the hoses, ensuring they are secure.

6. Check and Replace Blend Door Actuator (if necessary)

• Remove the dashboard panel to access the actuator.
• Disconnect the actuator and test it with a multimeter.
• If faulty, replace the actuator with a new one and reassemble the dashboard.