Overheating

Car started overheating, reservoir filling up with antifreeze and bubbling. Did a block leak test which showed no combustion gases. Changed radiator cap, did pressure test on radiator and found water pump was leaking. Replaced water pump, bled air yesterday and drove car for about thirty minutes, A/C and heat worked well.. Later yesterday I drove car about five miles, and it was doing fine on way home I stopped at store when I tried to crank car to come home car would not start. Checked battery cables and made sure they were tight. Tried cranking again, this time giving it gas and was able to drive car home, about 1/4 mile. This morning tried starting car and it started right up turned heat on, and no heat. Decided to try bleeding air again, reservoir filled up with coolant and was bubbling again. Please help. Need car and running out of ideas. Someone point me in the right direction. I replaced thermostat a couple years ago. Cooling fans do come on, but not sure if they come on as often as they should. They do come on when A/C is on. I bled again yesterday, and so far it's doing okay. A little 'sloshing' under dash, but no 'gurgling' sound as before I bled it. Thanks