How do you replace the thermostat on a four cylinder 2001 Jetta?

My Dad and I did this the other day. You have to take the alternator off to get to it. Once you get that out of the way you will see the thermostat, which has two bolts that come off- careful because your coolant will be pouring out. Replacing the thermostat is the easy part- just make sure you have the o-ring that goes with it.