Here's why:
* Hot Engine: A running engine has extremely hot coolant. Adding cold coolant to a hot engine can cause rapid temperature changes and potentially crack the radiator or engine block.
* Pressure: The cooling system is pressurized when the engine is running. Adding coolant under pressure can cause it to splash out or even spray, risking burns.
* Safety: It's simply unsafe to work on a running engine.
How to add coolant safely:
1. Let the engine cool down completely. This could take 30 minutes or more.
2. Open the radiator cap slowly and carefully. Be aware that there will be pressure inside.
3. Add coolant to the radiator. Use the correct type of coolant for your Honda Accord.
4. Close the radiator cap.
5. Start the engine and let it run for a few minutes.
6. Check for leaks and ensure the coolant level is correct.
If you are unsure about adding coolant, it's always best to consult your Honda Accord owner's manual or take it to a qualified mechanic.
