my Skoda Octavia NFL (2020-Present) heater only blows cold air what could be wrong

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal for safety.

2. Check and Refill Coolant

• Locate the coolant reservoir under the hood.
• If the coolant level is low, refill with the recommended type of coolant (typically a 50/50 mix of antifreeze and distilled water).
• Start the engine and allow it to reach operating temperature; check for leaks.

3. Replace Thermostat (if faulty)

• Drain the coolant from the system below the thermostat level.
• Remove the thermostat housing by unscrewing the bolts using a socket set.
• Replace the old thermostat with a new one, ensuring the correct orientation of the thermostat is maintained.
• Reinstall the thermostat housing and tighten to manufacturer specifications (usually around 10-15 Nm).
• Refill the cooling system with the appropriate coolant mixture.

4. Test Heater Control Valve

• Locate the heater control valve, typically found near the firewall.
• Disconnect the electrical connector and vacuum line (if applicable).
• Test the valve operation by applying voltage to the actuator, ensuring it opens and closes.
• Replace the valve if it does not function correctly.