I've been riding in temps between 0 and -25 C (32 and -13 F) and in all snow conditions, powder, hard trail, loose trail, etc and still haven't seen the overheating light. But been reading about a lot of overheating issues so have bought the Mountaintech vent kit, but not mounted it yet. I'm installing an under tunnel exhaust later this year, hope it doesn't mess up things. In order for rad's to be effective, you need proper air flow, both front and back.