Don’t change the coolant until you get the timing belt replaced. You should have the water pump replaced at the same time, and the coolant has to be drained. No sense in draining it twice. If I owned your car, I’d do the timing belt first. The interval for my Accord V6 was to replace the belt after 7 years or 108,000 miles, whichever came first. Yours is probably similar, and it’s in the owner’s manual. Might as well get a new serpentine belt at the same time too.
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