I can't say I've ever really had an issue with my 986's cooling, as I usually keep the A/C on (and therefore the radiator fans). I know that it warms up my garage, though.
Once I was stuck in very severe traffic in the 964 when just about every Interstate in town was backed up (due to one route being closed from a severe car fire). Sitting in that stupid congestion did not make it very happy (didn't overheat), but after slogging through surface streets to the open Interstate way north of town, once the air was flowing again all was right with the world.