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Coolant should be changed every 3 years or so. Just drain + fill with Honda-brand pre-mix. You can test the specific gravity (water/coolant ratio) with a hydrometer, the auto-parts store will sell you one. Just use the vacuum bulb to suck some up and see where the pointer is pointing. You should also look at the color - clear and blue is good. Cloudy or the wrong shade is bad.

Chip H.
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