why is my Honda Accord 10th Generation (2018-2022) losing coolant with no visible leak

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the engine is cool and the vehicle is positioned on a level surface.

Tools Required:

• Cooling system pressure tester
• OBD-II scanner
• Torque wrench
• Socket set

Parts Required:

• New radiator cap (if necessary)
• Coolant (as specified in owner's manual)
• Engine gasket set (if applicable)

2. Pressure Test the Cooling System

• Attach the cooling system pressure tester to the radiator filler neck or reservoir.
• Pump the tester to the recommended pressure (usually around 15-20 psi).
• Monitor for any drops in pressure, indicating a leak.

3. Inspect Internal Components

• If pressure loss is detected, remove the engine's valve cover and inspect for signs of a blown head gasket.
• Check the integrity of the cylinder head and engine block for cracks.

4. Replace Faulty Components

• If a blown head gasket is found, remove the intake manifold and cylinder head.
• Clean mating surfaces and replace the gasket with a new one, ensuring proper torque specifications during reinstallation.
• If the radiator cap is faulty, replace it with a new one.

5. Refill and Bleed Cooling System

• Refill the cooling system with the appropriate type of coolant.
• Bleed the cooling system to remove air pockets by running the engine with the radiator cap off until the thermostat opens.