[Spyder01]

If its just the light coming on, then i'd say you probabaly got some snow over the sensor or sumthing, happened to me when i was playing around in the snow. But if you say the temp guage is all the way to the red line, you better pull over to the side of the road, turn the car off and let that temp go down a bit before driving again. Its most likely your coolant leaking. But if the guage does reach all the way to the right, your vents should start blowing steam into the car rather than air.