LittleD: Something to think about is that the systems on the smaller tractors can struggle to keep the cab area cool. I have ran into this on the JD 5000 series cabs. The area in the condenser and evaporator is smaller than on the larger tractors. IT is even worse on your NH 2420 in that you do not have an isolated cab. So you will get heat off of the drive line.
Make sure that the evaporator and condenser are completely clean. I use compressed air and a garden hose to clean them. I never use high pressure water. You can damage them.
You should see a 40-50 degree drop across the evaporator if everything is working well.
Check and make sure the heater core is actually cool. I have had controls leak a small amount through the control valve an it take very little to make the AC not work well.
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