What happens to my car when thermostat changed?

i am getting the thermastac changed on my car soon cos it keeps overheating was just wondering weather when the thermostat is changed do they flush the water system out to and if yes will they replace it? any answers?
What happens to my car when thermostat changed?
Yes they have to drain most of the water out of the radiator when they replace the thermostat. Any half way decent shop would replace all the coolant at the same time. You can always ask to be sure.
What happens to my car when thermostat changed?
It depends on what you say to them about the coolant.It's not water at all. If you need the coolant replaced with a fresh one ,then it is flushed. If there is no need to change the coolant ,then it is topped off to the proper level.

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