98 Lumina Coolant System

had heater core replaced; later, son insisted water pump needed to be replaced. low coolant light flashing - bleeded system, but water doesn't appear to be circulating. any ideas?

Welcome to AF, please post the engine size and when the system was bled did you get a good coolant flow from the bleeders? Take cap off when cooled down, check the level in the radiator.

3.1L engine; had opened both bleeders & had radiator cap off. Coolant appeared to be coming out of bleeders, but level was not dropping in radiator.

3.1L engine; had opened both bleeders & had radiator cap off. Coolant appeared to be coming out of bleeders, but level was not dropping in radiator.
thers a low coolant sensor on the side of the radiator , probly bad..