why does my Toyota RAV4 heater blow cold air

Solution

1. Preparation

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

2. Check and Replenish Coolant

• Locate the coolant reservoir; remove the cap.
• If low, mix the appropriate coolant type (Toyota Long Life Coolant) with water in a 50/50 ratio.
• Fill the reservoir to the recommended level and replace the cap securely.

3. Replace the Thermostat

• Tools Required: Socket set, torque wrench, gasket scraper
• Drain the coolant from the radiator into a clean container.
• Remove the upper radiator hose from the thermostat housing.
• Unbolt the thermostat housing using the socket set.
• Remove the old thermostat and clean the mating surfaces.
• Install the new thermostat ensuring the spring side faces the engine.
• Reattach the thermostat housing and torque to manufacturer specifications (typically 11-15 ft-lbs).
• Reattach the radiator hose and refill the cooling system with coolant.

4. Flush the Heater Core

• Tools Required: Garden hose, bucket
• Disconnect the heater core inlet and outlet hoses from the engine bay.
• Using a garden hose, flush the heater core in both directions until clean water runs out.
• Reconnect the hoses securely.

5. Test the Blend Door Actuator

• Reconnect the battery terminal.
• Turn on the ignition and set the heater to maximum heat.
• Listen for any clicking noises from the dashboard indicating actuator movement.
• If the actuator does not move, replace it as necessary.