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

Solution

1. Preparation

• Gather tools and materials before starting the repair.
• Tools Required:
  • Screwdriver set
  • Pliers
  • Torque wrench
  • OBD-II scanner (for diagnostics)
  • Cooling system pressure tester

2. Check Coolant Level

• Open the hood and locate the coolant reservoir.
• Ensure the engine is cool before unscrewing the cap.
• If the coolant is low, top it off with the appropriate type of coolant (refer to owner's manual for specifications).

3. Inspect for Leaks

• Visually check the hoses connected to the radiator and heater core for leaks.
• If leaks are found, replace damaged hoses or components.

4. Thermostat Replacement (if faulty)

• Drain the coolant from the radiator using a drain pan.
• Remove the thermostat housing by loosening the bolts with a socket set.
• Take out the old thermostat and replace it with a new one, ensuring the gasket is in good condition.
• Reassemble the housing and refill the cooling system with the correct coolant.

5. Heater Core Inspection

• Disconnect the heater hoses from the heater core located behind the dashboard.
• Use a cooling system pressure tester to check for blockages in the heater core.
• If blocked, flush the heater core with water, or replace it if necessary.

6. Reassemble and Fill

• Reconnect any hoses removed during the inspection.
• Fill the coolant system to the appropriate level and check for leaks.
• Start the engine and allow it to reach operating temperature, checking if the heater now blows warm air.