I replaced my 2004 Nissan radiator and thermostat still over heating , any ideas?

First assumption: Your car is over heating and not your car interior air heating unit part of your A/C.
Second assumption: You car is still over heating when you try to run the A/C.
If you replaced the radiator AND the thermostat it can then only be in the plumbing which consists of the hoses running from the radiator to the heater coil in the blower unit or a blocked water route in the cylinder block of the engine. Assuming the hot water plumbing (black radiator type hoses) is all OK and you have the air routers (call them flaps or whatever) set so they don't inhibit the air flow and aren't set to route the air over the cooling coil and ARE set to route the air through the heater coil, I would suspect first a mis-set air difuseror flap. The heater coil is the one the blower blows the air through to warm as it flows into the car. Depending on your make and model of car, that will be located somewhere between the blower and the heater output in the car. Once you locate that, check to see if it is set in the position to route the warm air through to the car and not cool air through to the car. The cool air will have to flow through the evaporator coil of your A/C to the interior of the car whereas the heated air flows through the heater coil to the interior of the car. You can also locate the heater hose by tracing it from the radiator if you have trouble locating which hose it is.
You can check to see if your block is stopped up by removing the hose from the radiator to the block and the hose from the block back to the radiator. Also remove the thermostat. This isolates the block from your normal cooling system. Make sure you have a hose running water into your block and the same amount of water is coming out the other end of the block. This isolates your block from the rest of the cooling system. If your block water jacket is clear, water will flow freely through the block and your engine should be running very cool. If water does NOT flow through the block freely then you have a blockage in your block. Not good.
If all checks OK with the above, then using the same method, check to see if water flows evenly through your radiator and all your hoses in your heating and cooling systems. You will have a blockage somewhere in here if your engine block is clear which you just demonstrated. Put the hose inro the radiator input and see it if comes out equally at the lower end of the radiator. If you have a clean radiator as you said, it will. Then check the hoses from the bottom of the radiator to the engine block and the top of the radiator to the engine block. One of these will be the blocked hose. Replace this hose or clean it out and re-install it. Preferably replace it with a new hose. You should now be good to go. Good luck.

Is the thermostat installed up side down. That does happen sometimes and will cause that.
Is the radiator a new one if not could be plugged and won't let the antifreeze flow.
Is the water pump functioning right. Check your belts as well.
Is the fluid in the rad up where it should be. Low fluid will cause the water pump to not work. Just thoughts of what would cause your problem.

Simply could be a bad coolant temp sensor.......if you have temp gun shoot temps at your radiator hoses while idle to see if is truly way over the norm(220 degrees)......look up how to test coolant temp sensor on youtube........had this problem with 05 GMC pickup wouldnt let it run computer shutting it down because it thought it was overheated.......

Check for flow from the water pump. The water pump moves the coolant through the system. Common ailments broken belt, clog in the system and mis reading on temp gauge.

when your cars engine has been running for a while and seems warm. You can use an infrared thermometer to check the temp of the upper and lower radiator hoses.

If if you have to go about this the lo tech way... Consider all of the hot and moving parts.... Scalding fluids, fan blade and belts etc...

shut off your warmed engine...

If if you're careful you can compare temperatures with a surface thermometer or carefully touch the surface and note for drastic temperature differences betwixt the hoses... Ie lower radiator hose cold vs much warmer or hot upper hose...

There are some cooling system designs that will allow you to visually observe the coolant flow into the radiator if you remove the radiator cap. (Wear safety equipment please.) gloves and eyewear especially.

Could be a weak water pump, or your electric fan is not kicking in. Start the car up and let it heat up. Look to see that your fan kicks in . If the fan does kick in, I'd say you have a bad water pump. Do you get good heat from the heater?

Bad water pump, or hoses are collapsing , get new water pump, put springs in hosed to keep them from getting sucked closed

Hi Vincent, it seems the motor needs a big flush out at a radiator specialty shop. Stay safe Greg.