[Daox]

I completely agree with Bob. If you don't have much airflow (and you won't with a full grill block), the air thats already gone through the radiator is gonna be very hot and not capable of absorbing much more heat. You'll get less and less cooling from the same amount of surface area to the point where its almost going to be useless and just adding unnecessary weight.

Since I am running a full grill block year round on my Paseo, an idea I had was to use an aluminum belly pan and braze copper tubing to it. I would run that in parallel or series with the radiator for additional cooling. I don't like the aluminum hood idea due to possible injury from a 200F+ hood.

Honestly, with my 21 mile commute, my radiator fan comes on at most (peak heat in summer afternoon driving) a half dozen times for 10-15 seconds. I just deal with it and basically use the capacity of the cooling system to do the majority of my cooling. This is obviously not a good idea for longer trips though.