We have changed water pump, thermostat, and the coolant temp sensor. And the heater core was recently changed due to it being plugged. The heater will blow cool air unless the engine is above 2000 rpms and then it blows warm air. Their is no smoke or steam coming off the engine when it over heats but the car will stall out if it is in the red. The over flow container stays full although today seemed to be leaking antifreeze near the over flow container. And the oil is clean.
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Most likely you have what is known as an "air lock" in the cooling system--basically it's an "air bubble" stuck in there, and sometimes they can be a real bugger to get out. there should be a "bleeder" valve somewhere close to the thermastat housing, if not actually part of the thermastat housing. Find the bleeder valve, warm the vehicle up until the thermastat is open, and then gently open the bleeder, be very careful not to get burned by hot coolant, you may have to do this several times to be sure all the air is out of the system.
