Had a friend look @ my car with me. It was running a little rough and was leaking coolant. The coolant light had been off and on for a few weeks. When I took the car in for an oil change, the technician said that the water level was okay and that it was probably just a sensor error. Anyway, when I opened...

Either you've got an air pocket in the system or the incorrect or inoperative thermostat. Just because it's new doesn't mean it's working properly. Or your water pump is failing. The Automedia Answer Guy