Hi there,
I don't understand why he wouldn't be able to fit the radiator.. I'm running a regular flex fan off the engine and it's even got a spacer on it. I'm running a 4 core radiator that fit perfectly. My truck wasn't cooling very good at a idle because my idle is set at 650 rpm. So what I did was install a 14 inch electric fan on the outside of the radiator, with a temp sencor and that fan kicks on when the other one can't handle it. There is actually a lot of room behind the grill, all that you need to do is cut a little bracket off.
If he doesn't have room for serpentine belts, then convert to performance v-belt pulleys.. And maybe not even run a fan on the inside, just the outside.
Where does he live ? does he even need a the a/c ? I just got rid of mine, but then again I live in Washington state.
If you have any questions about what I did, then feel free to e-mail me.
Take care,
Oknut