Bay 13 is right as I've done hundreds of times myself. The whole dash must be removed, then the heater box as well. Not an easy job for a DIY by any means and it takes most people about a day or so the first time but gets easier each time thereafter.
Heater cores are much easier as the whole dash doesn't need removeval for that, just a box under the dash center area.
Haynes manuals are total garbage really. I have one for another brand of older car and it was the biggest waste of $10 I've ever spent.
If you want to do it yourself and want a good manual, you can buy an OEM 850 climate control manual directly from Volvo by calling 1-800-25-volvo.
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