Jim, I don't know your chassis but would be surprised if the radiator swings out.
The Charge Air Cooler (CAC) is typically the first layer in the "sandwich" that includes the radiator and is closest to the fan. It's purpose is to cool the air somewhat between the output of the turbocharger and the intake on the engine. Because it can be pressurized to 28lbs by the turbo, it is important to keep all of the joints in the CAC tight. Flexing them would not be a good thing. You can trace your CAC piping starting at the turbo.
Belt replacement on my Cummins 5.9 (ISB) is a lot less daunting that it initially looked. The biggest problem was the A/C compressor belt which at least must be loosened and removed from the compressor pulley. On mine the serpentine belt is closer to the engine block. I worked from the top to loosen and remove the A/C belt from the A/C pulley.
The most important thing to have before attempting a serpentine belt replacement is an exact diagram of the belt's path. I've had more than one person contact me for a copy of my diagram when then failed to make their own first. Trust me, you won't remember.
On mine, I needed a 3/8" adapter to allow me to use my long handle breaker bar in the belt tensioner. I could reach this from underneath. I put the breaker bar and adapter into the tensioner, used one hand to shove it hard and the other hand to flip the belt off the back of the tensioner. If you properly position everything, it takes less than 10 seconds. With a long breaker bar and proper leverage, it isn't that hard to do.
With A/C belt out of the way and the serpentine belt off the back of the tensioner, it only takes flipping that belt a couple of times to make it fall off all the pulleys but the fan. The belt is more than long enough to flip over the fan blade but it does taking reaching up pretty high to do it.
Putting the new belt on is just the reverse: flip the belt over the fan, use the diagram to route the belt around all of the pulleys except the tensioner and then use the breaker bar and free hand to take loosen the tensioner and put the belt on the back of it. I've had to try this 2-3 times before I get it.
Yes, it is a fairly tight space between the engine and the front surface of the CAC but my Ford Econoline van was much worse. I'll put sepentine belts on the Cummins all day long before I want to tackle the one on the Ford.
2000 Georgie Boy Landau 36' DP
2005 Saturn Vue toad