1993 Chevy Lumina Overheating Problem

What could it be? 3.1L ,150,000. I bought this car for my fiance 2 months ago. New Radiator,Water Pump, Thermostat, Hoses,Coolant Bottle that I put on after 1 week. We can drive car for a day or two and the
same problem happens. Coolant Bottle almost full,no heat out of the heater, Hoses ready to burst yet no idiot light comes on. I'm not getting Anti-Freeze to go back into motor.I bleed the air out of the system and it works for a little while. Anyone have this problem before? ANY HELP WOULD BE GREATLY APPRECIATED.

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