my Toyota RAV4 XA50 (2019-2024) heater not working what should I check

Solution

1. Preparation

• Tools Required: Socket set, screwdrivers, OBD-II scanner, coolant tester, multimeter.
• Ensure the engine is cool before starting work.
• Disconnect the battery to prevent any electrical shorts.

2. Check Coolant Level

• Open the hood and locate the coolant reservoir.
• If low, add the appropriate coolant mixture (50/50 antifreeze and distilled water) until it reaches the recommended level.

3. Inspect Thermostat

• Locate the thermostat housing.
• Remove the bolts and the housing.
• Check the thermostat for free movement; if it's stuck closed, replace it with a new one (ensure it opens at the correct temperature).

4. Heater Core Inspection

• Remove the dashboard or access panel to reach the heater core (if necessary).
• Inspect for leaks by checking the hoses connected to the heater core.
• Flush the heater core with a garden hose if it appears clogged.

5. Check Heater Control Valve

• Identify the heater control valve (usually near the firewall).
• Test the valve operation by applying voltage to it using a multimeter; it should open when the heater is activated.
• Replace if it does not operate correctly.

6. Cabin Air Filter Replacement

• Locate the cabin air filter housing (usually under the dashboard).
• Remove the cover and pull out the old filter.
• Install a new cabin air filter, ensuring it is oriented correctly.