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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Today's Featured Article - Fordson Model N: Field Service Operations and Lubrication - by Anthony West. The daily or weekly servicing of any vehicle is of the utmost importance, and in days gone by when our favorite tractors were doing an important and Commercially vital job on the farm, these service operations would make a major difference to the running costs and economy of the farm. This being so, it surprises me to see how many enthusiasts attending rallies, shows etc, seem to be unaware of the importance of this constant attention. Possibly the modern machine with its 6,000 mile or even once
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