http://www.nissanoffroad.net/how_to/...ion_cooler.asp
I am in the process of installing a cooler myself, and I would change it as follows:
Remove the bolts holding the coolant overflow tank (passenger side) and intake resonator tube (driver's side) from the brackets that secure the radiator to the radiator support.
Pull the intake resonator tube (still attached to the throttle cable) out of the intake and move it clear of the radiator.
Remove the brackets holding the radiator to the radiator support.
Tilt the top of the radiator back so you can get in between the radiator and the A/C condenser. You can now run the cooler mounting "rods" he refers to (they're like zip ties) through the condenser alone rather than through both it and the radiator. No worries about the fan shroud getting in the way.
Rather than run the cooler lines down under the radiator, consider mounting the cooler so that the input/output is pointing to the passenger side and run the hoses through the gap between the condenser and the body to get them into the engine bay. You'll need to cut a 1x2" piece out of the plastic on the edge of the fan shroud there to do so. I just don't like the way the hoses are "exposed" down under the radiator, when 'wheeling there is a chance something could find its way into that space and damage them.
Brent