Mr T is right. The '98 gets the t-belt ONLY at 70K miles as mentioned in your maintenance book and the tensioner is suppose to be checked only (before removing the old belt). I know of no one who replaces tensioners with every t-belt, not only that but most dealerships don't stock them either and they're not cheap.
The '99 cars then went to a 105K t-belt interval and (as before), the tech is suppose to check the tensioner ONLY as specified in VADIS, which is now where all service info for the newer cars is. If and only if the tensioner doesn't pass the inspection (done before removing the old belt), then it's to be replaced.
If VCNAs site claims anything else, then what's written there is not quoted from Volvos own service literature which would also seem strange to me.
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