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Place car on a steep incline or raise front end up higher than the heater core. Now, add coolant to the radiator as needed, with engine warmed up. It sounds like the radiator is lower than the heater core causing an air lock and if that is the case this will allow the air bubbles to escape.
If you look one of the fans will be behind the radiator and the other will be behind the A/C condesor. The A/C condesor fan should run as long as the A/C is on. The radiator fan will cycle on and off as the temperature sensor tells it too.
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