Hybrid Racing K20Z3 upper coolant neck adapter was designed for 2006-2011 8th Gen Civics or K-Swap owners who need to modify or improve the function and form of their car’s cooling system. It boasts full 6061-T6 aluminum construction, lending it a strong and lightweight design along with a clean appearance that will put your OEM coolant housing to shame. The kit’s modular design allows the user to configure it to their exact setup.
Once all of the parts are tight, fill the system with coolant and bring the engine up to operating temperature. Check for and fix all leaks.
Be sure that the car has enough coolant and monitor your temperature gauge. Once the engine warms up, the thermostat will open requiring you to add more coolant to the system.
If you are having trouble getting the air out of the system, you can use the top mounted bleeder screw.