Good morning.
Before your guy changes the starter, ask him if the engine turns free. If the engine will not turn, if it does not turn, then ask him to remove the spark plugs and see if it turns. If the starter is not the problem you will be spending money on something that is not the issue.
From your description, it sounds like you may have an issue with a failed head gasket from overheating. That is when coolant gets into a cylinder and it would emit white smoke when running or may not start at all.
Your guy can pressure test the cooling system with the engine running to determine the coolant leak. He should know that.
Roy
https://www.2carpros.com/articles/head-gasket-blown-test
https://www.2carpros.com/articles/radiator-pressure-test
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Saturday, October 3rd, 2020 AT 10:57 AM