new radiator new thermostat,new upper&lower hoses,car gets hot cold air upper

Possible water pump issue. Have a mechanic take a look at it.

On a lot of GM cars the water bypass is through the heater core, as the heater coil is always hot. Feel in and out lines of heater hoses and see if they feel hot, if not heater core could be blocked. Once engine is hot the thermostat should open and you can feel top hose getting hot. And water should then be circulating through radiator. Like mentioned, it could be a bad water pump too.