Ik i drained my radiator today and flushed water through it then filled it back up. Then went to get air out of system by. Turning it on turning heat on letting it run and bubbles come out. They just kept coming until fluid got so hot it start spewing out of my massive funnel. Fan never came on so i assume thermostats never kicked on. Never got above middle line on temp gauge on dash. It ran for like 20 min. I don't know what to do or why's going on. I replaced the ect sensor a few months ago. Could it be bad or i did it wrong. How to fix or diagnose.