Urban said the thing overheats in stop and go traffic. Which means some sitting, some low speed driving to the next light, etc. That's what HE said anyways. So that's what we've been going on.
I have a 20x12x3 core IC sealed to the face of my stock radiator, both behind the stock a/c condenser. So you can imagine i've got shit blocking airflow too. I have a 195*F thermostat, fans on at 200*F. From 195*F, it takes about 2 minutes of idling before it hits 200 and the fans come on, run for ~25 seconds to pull it down to 197*F, then it's off . If I'm at say, 199*F fans off and I pull away from a red light, in 20 seconds temps have fallen to 195*F again, and they won't go any lower. So if I do this and catch another red light, I'll be sitting there for 2 minutes before the fans even come on.
If he's driving and coming to a stop and it's already too hot, he has airflow problems.