why does my Honda Civic 9th Generation (2012-2015) heater smell like antifreeze?

Solution

1. Preparation

• Gather tools, including a socket set, pliers, and a coolant pressure tester.
• Allow the engine to cool before starting work to avoid burns.
• Disconnect the negative battery terminal to ensure safety.

2. Locate the Leak

• Remove the passenger side under-dash panel to access the heater core.
• Inspect the heater core for any visible signs of leakage or corrosion.
• Check the connections and hoses leading to and from the heater core for any signs of coolant.

3. Replace the Heater Core (If Leaking)

• If the heater core is leaking, remove the hoses connected to it using pliers. Be prepared for coolant to spill.
• Unbolt and remove the heater core from its housing.
• Install the new heater core by reversing the removal process, ensuring all seals are intact.

4. Replace Damaged Hoses (If Necessary)

• If any hoses are damaged, remove and replace them with new ones.
• Ensure the new hoses are properly clamped and secured.

5. Refill Coolant

• Refill the cooling system with the appropriate type and mixture of coolant as specified by the manufacturer.
• Start the engine and let it run until it reaches operating temperature, checking for leaks.

6. Reassemble Components

• Reinstall the under-dash panel and any other components removed during the repair.
• Reconnect the negative battery terminal.