how to diagnose if my Skoda Octavia’s heater core is clogged

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is on a level surface and the engine is cool.
• Disconnect the battery to avoid any electrical issues.

2. Drain Coolant

• Place a drain pan under the radiator.
• Open the radiator drain valve and allow the coolant to completely drain from the system.

3. Remove Heater Core Hoses

• Locate the heater core hoses at the firewall.
• Using a pair of pliers, loosen the hose clamps and carefully remove the hoses from the heater core ports.
• Expect some residual coolant to leak, so have a rag or towel ready.

4. Flush the Heater Core

• Connect a garden hose to one of the heater core inlet/output ports.
• Flush water through the heater core in both directions to remove any blockages or debris.
• Continue flushing until clear water flows out.

5. Reinstall Hoses

• Reattach the heater core hoses, ensuring they fit snugly.
• Tighten the hose clamps securely.

6. Refill Coolant

• Close the radiator drain valve.
• Refill the cooling system with the correct type of coolant as specified in the owner's manual.
• Start the engine and let it run until it reaches operating temperature, checking for leaks.

7. Final Check

• Monitor the temperature gauge and heater performance.
• Ensure no leaks are present at the hose connections.