When I was playing around with my heater core, I don't remember having any trouble detaching the hoses from the firewall. The connections were about in the same condition as yours appear to be (good). Push the hose as far into the firewall as it will go with your left hand, twist the cuff on the connector counterclockwise with your right hand to unlock, and the hose should then hopefully pull off. In my case, I didn't have to use much force. In fact, removing and reattaching the heater hoses was probly the most pleasant part of the job for me!
Have you seen the first picture of this tutorial?: http://www.volvoxc.com/0/resources/h...r_removing.pdf
2007 XC70, 206,000 miles
2002 V70XC, 130,000 miles, parts car
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