[jux2pos]

I recently replaced my heater core but still have no heat in the car - Here is some background information:
When I purchased my vehicle in the summertime I knew that the heater core needed to be replaced. After pricing the labor at the dealer and the part at the local auto store I decided that this was a job I would do myself. Shortly after buying the car, the radiator sprang a leak - I replaced it with a new radiator; the water pump then failed - again I replaced; then the serpentine belt snapped on me so I replaced it as well (all within 2 months). Finally i undertook the job of replacing the heater core (quite extensive and probably worth the amount the dealer would charge). Still no heat. As a last resort, I replaced the thermostat figuring it was the last component left in the cooling system and still have no heat. Since replacing the thermostat, I have also flushed all the coolant and refilled the system with fresh coolant and now get the low coolant light. From reading the experiences of others on this site, I will try the old screwdriver tap trick to get rid of that
ANY IDEAS ON GETTING THE HEAT FLOWING?????