on the 3200 it is a dual radiator with the oil cooler. I have replaced the one on my car, i had to pull the cooling fans out, but i think it can be done from below the car. it is the full width of the front of the car, so you have to remove a lot of stuff to get into it. On the 3200 it can be withdrawn from below once you remove the metal chassis bracket that runs along the bottom there holding all the radiators in. The 4200 may of course be completely different as its a different engine.