I agree with EarlyBird, there should be enough air for cooling. But if the heat does not get to the rad then it cannot cool it. Do you know if the thermostat is working properly? You can test it in boiling water to see if it opens at the right temp.
Do you flush the system?
We rented a car once and it overheated. My Dad checked under the hood found the fan was in backwards (blowing into rad).
Engine Test Stand Playlist: https://www.youtube.com/playlist?list=PLwoxyUwptUcdqEb-o2ArqyiUaHW0G_C88 restoring my 1968 Firebird 400 HO convertible (Firedawg) 1965 Pontiac Catalina Safari Wagon 389 TriPower (Catwagon) 1999 JD AWS LX Lawn tractor 17hp (my daily driver) 2006 Sequoia 2017 Murano (wife's car) 202? Electric car 203? 68 Firebird /w electric engine 2007 Bayliner 175 runabout /w 3.0L Mercuiser__________________________________________________________