Direct airflow is of course ideal but the cooler will radiate heat even with no airflow. The real fins all over the quality coolers give it insanely more surface area to ditch heat. About 70% of my core is exposed to air. While I can get it up to 220 even on the highway with good constant air, if I lay off it cools down very quickly, maybe a minute. If i get it that hot when dealing with stoplights and limited airflow it takes much longer to cool. I sometimes think about putting a nice spal fan on the backside of it to keep air moving while idling at lights or in the pits
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