Bleed the lines put new antifreeze in. when returning from the machanic on the way home car started to run hot again. I had replaced the head gasket in the car also.

This link may give you several ideas:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-3.html#post235973