Hey guys, not sure if this is an issue to be worried about.

Just been getting really really warm air, almost hot coming in through the vents when i turn on the switch where air from the outside goes into car.

Could it be just maybe because its cold outside? Ive had a puncture in my radiator hose not long ago... can this be related?

I'd guess it depends on whether you have the temperature dial set to hot or cold - if it's on hot (or above 23 deg), then the forward motion of the car will force the outside air into the car via the heater which will be full of hot coolant and heat this air. It should cool down if you turn the temp down to cold (with aircon off). So I'd say it's pretty normal....but I could be completely wrong.