Originally Posted by ChrisSlicks

The radiant heat has no detrimental effect on the A/C. At speed the air flowing off the oil cooler is only going to be 5-10 degrees warmer than it was before the oil cooler was installed. There is still plenty of air pressure to force the air through the radiator and condenser.

There is also nothing wrong with putting the cooler behind the bumper cover on either side, but the problem in that case is generating enough air flow on both the inlet and outlet side.