Infiniti Repair Questions? Ask a Mechanic for Answers ASAP
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Low ATF will not cause the car to overheat. If there is still air in the system from replacing the radiator, that will cause the car to overheat. Check and make sure the cooling fans come on, and make sure there is heat from the heater at idle. If there isn't then there is air in the cooling system still and it will need to be bled out.
If the cooling fans aren't coming on, then the wiring to the fans should be checked.
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There is a special tool for this, however you can do it with a spill proof funnel and a set of car ramps.
Install the funnel on the radiator, put the car up on jack stands if you have them or get the nose about 22 inches off the ground.
Start the engine and run it to about 2500 rpms until it comes up to temp. Turn the heater on high and wait until you have heat. Then turn the engine off and allow it to cool for a bit. The funnel should have some coolant in it when you begin this procedure. Then as the engine cools off the coolant will get sucked into the radiator. Do this as much as needed to get heat at idle speed. Once you have heat at idle, turn it off, wait for it to cool down, remove the funnel and top off the radiator. This should get all the air out. Air pockets get trapped in the heater core because it's higher then the radiator. This process gets the radiator higher then the heater core so the air will travel there and burp out.