So Ive had straight water in my sbc powered 32 while breaking in the new crate motor. I drained the water out and added antifreeze water mix and now I have an air lock. I ran the heater, squeezed the hoses, I took out a pipe plug near the t stat housing and added water until it was topped off. Ive done this three or our times and each time I add a small amount of coolant but it still has air trapped somewhere. Any ideas of anything else I can do? I have heard about drilling a small hole in the t stat.