My lower radiator hose was the first leak. I removed the hose, roughed up the plastic with Emery cloth then used the old black permatex with a spring loaded clamp. That seemed to fix that connection. The next was the radiator hose on the thermostat housing. I just double clamped that one. 3 rd was the heater core bypass valve. Just a simple tightening on that. Good luck chasing leaks. I thought it was just me. I never had a cooling system so hard to contain before 😡