Car has a d16y7 I replaced the radiator fan relay and switch but I jumped off the wire for the switch and the fan came on it. The temp gauge sits at operating temp but the water just steams out the radiator. It's not running too hot but I have the fill the radiator up after about 150 miles.

 

Bleed the cooling system.

https://honda-tech.com/honda-civic-d.../#post39830585

 

Any visible leaks? Or just losing water at 150 miles?

 

Sounds like head gasket