Need assistance I’ve tried all my options. water pump was leaking from the weeping hole , I’ve replaced the pump , and tried to bleed the air out of the system , but it has excessive bubbling and also noticed the top radiator hose was popping on idle . Replaced the thermostat thinking it was not opening , concern is still there , I’ve done compression test 2 cylinders are at 125 while the other 2 are at 150 . Performed cylinder leakage test and all passed . I also did a cool and pressure test and did not loose pressure within 45 minutes. I have removed all the hoses , cleaned the radiator , put water in block to make sure there was no clog . If you have any ideas with what the problem is please let me know .