as long as the extra cooler is mounted up front it will get airflow across it to help cool my factory cooler was right behind the grill in front of the a/c condenser. Now when its stopped the radiator should be able to cool it with no issues. but when towing the cool air across the extra cooler should bring the temps down. You can add an extra fan but you don't have a lot of room out front and you have to make sure it flows the same way as the radiator fan or it will do more harm than good.
New DD-2009 Ford Mustang GT/CS candy apple red.
(sold)2003 XLT Tan 3.0L V6 5-speed, Lots of mods.