I seem to be loosing my antifreeze out the overflow. 3 times today I say it leaking so filled it up again. Once it steamed for quite awhile, after loosened the cap. The other times ,it wasn't pressurized. The time it was, the hot sign flashed temperarily then quit. Any ideas, anyone? Thank you.

 

Only thing I changed was replacing the nyroc pipe mod the the echo pipe. Could that hold more back pressure to make it over heat?