Fluid change is not a concern at this age. Indeed, I would never change the coolant anyway for reasons argued in another post.
Seven years old is just the right age to spend a summer weekend underneath with a wire brush, large screw driver as a scraper if necessary (I don't know how badly Hyundais rust), a can of Kurust and a pot of Hammerite black paint to apply afterwards. As well as applying to anything that looks rusty, clean and paint the brake pipes, which will just need occasional cleaning and greasing thereafter. The ones on my 1980 TR7 are original.
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