All the symptoms you describe suggest the engine is getting hot to the point it’s boiling, but the gauge should be indicating it’s hot by moving to the hot end of the scale. That’s if it’s working. Make sure the coolant is topped up, and check the electric fan to make sure it is working. I would run the engine at idle with the automatic transmission in drive for a period of 10 minutes and watch the temperature gauge. If it does check to see if the electric cooling fan is running, it it’s not running switch on the air-conditioning and see if it runs then. If it does there could be a problem with the fan sensor.

If it smells like it's burning then it is probably overheating. Don't take too much notice of the gauge, because it could be faulty. You need to find out why the fan isn't working, which could be because of a wiring issue, a blown fuse, or a burnt-out electric motor, and get it fixed.

Magna belts are generally pretty durable, but the recommended change time is 100,000 km.