2005 Pontiac Aztek overheating and no heat

I have replaced the water pump, radiator hoses, thermostat, tempature sensor and put all new coolant in and bled the bleeders in my aztec I start my car up and if I go to town not far from home it gets hot really quick and the hot coolant light comes on I ammediately shut my car down when I pop the hood my coolant in resovoir is boiling I dont think its the heater core cause my windows dont fog up upon starting and I have no leakage on passenger side of car. I dont have no leakage anywhere on my engine with coolant