I'd be leaning towards a bad waterpump, rather than the temp sensor, especially since you say you're getting no heat. Your coolant level is correct? If you can get the thermostat out again (and if the Jetta 2.0 is the same as the Beetle) you can reach your fingers in the thermostat hole and to the left and feel the waterpump impeller. If it's broken, you'll know it.
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