My car's water pump is faulty

What is your question?

The BMW dealership diagnosed it and is asking for ~$2000 to replace the pump and thermostat. Another repair shop quoted $1300 for the same set of repairs. Is it worth to take the risk, and drive my car 30 mins from the dealership to the other repair shop?...I am afraid, I will end up damaging more parts than saving the difference in costs.