Coolant Question - 2013 GT 2.5

[carsncars]

Hi all - happy to join the community. I just picked up a new-to-me 2013 Mazda 3 GT 6MT last week, and have been enjoying getting acquainted with the car.

I happened to notice yesterday that the coolant is on the low side. When researching what to top it up with, I realized that at some point in the car's history the coolant had been replaced with some sort of orange coolant. There was a small front collision claim, so I could see it being replaced if the radiator was repaired at some point.

As far as I can tell, my car should have come with green FL22 coolant.

• I'm assuming it'd be bad to just top up the orange coolant with more orange coolant, given that I have no idea exactly what the coolant is
• From reading it also seems like a bad idea to switch to green coolant without a proper flush

Should I go to the dealer (or if anyone has any recommendations for independent shops in the Vancouver area...) and ask them to do a complete flush with FL22? Is there a DIY flush procedure I could do at home that flushes the system adequately to ensure no orange-green mixing?

Thanks for the advice!

[carsncars]

(To elaborate on the DIY flush question - it seems like the regular coolant flush procedure only changes about 1/2 the coolant system's volume)