The 2.5L QR25DE engine requires a special tool to refill the cooling system to effect an air bleed from what I can see. Tool number KV-991J0070. Involves using a compressed air powered venturi gadget attached to the top of the radiator. It’s not a simple procedure.
Based on that, its doubtful you’ll be able to solve this problem using typical diy’er methods. Probably best to have a shop with that tool do the job for you. You could try the method suggested above, get the front end of the vehicle high up in the air and run the engine until the thermostat opens with the radiator cap off, making sure the heater control is on max coolant flow to the heat exchanger. Might work.