changing a thermostat on 2006 Ford Fusion

My local Pep Boys is giving me an estimate of approx $330 to change a thermostat. This includes a flush & fill which is needed as well. Is it mandatory that a flush & fill be done?

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1 answer
So much coolant will come out during the repair that you'll need to add more. They could just add more coolant if it's cheaper than "flush and fill" service.