I have an 04 impala 3.8l v6 it almost always stalls the time starting with cool engine. And also the temp guage gets up to the halfway point daily but never much higher and the ac starts blowing hot. Has never overheated. Ive replaced water pump, thermostat, radiator and cap, flushed and bleeded cooling system. Hoses look good, fans come on with ac set to high havnt noticed any coolant leaks, no coolant in oil. Dont know what else to try. Anyone have any ideas.