I have two quick questions:
Thanks for your time and help.
My car has 150000 miles.
My car has an automatic transmission.
Hi there. Anytime the coolant system is worked on, a professional mechanic should verify the service steps with the manufacturer's service guide. This will help them determine the right steps to complete the coolant bleeding - if it's mandated by the individual manufacturer. It's also a standard operating procedure for a mechanic to drain the coolant anytime replacing coolant system components; such as thermostat or coolant lines.
The radiator cooling fan relay is not one of those items that generally requires the fluid to be fully drained, but some mechanics will flush the radiator as a preventive maintenance service.
If you need to have further help having this checked, a certified technician from YourMechanic can come to your location to pinpoint any faults in the system.
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