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I'm glad that I think we've resolved this. I've given further thought to why the included instructions mention reprograming and I believe it's possibly due to the fact that Volvo parts are sold to many different markets and perhaps in some markets the newer cars ('98 on up S/V/C 70s, etc) don't normally come with any pollin filter (wouldn't be an issue in the US however). If those cars didn't come with any pollin filter, then yes, it should be added as per Vadis as I mentioned earlier as that would increase blower motor speed on that car (one originally w/o any filter from Volvo in that market).
As for earlier cars like the 850, non came with that filter and there's no option available by using the VST to add one and yes, I did check. The 850 requires no such programing in the US market, just put the filter in and drive :)
Hopefully we've now solved this "mystery"
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