The voltage regulator protects all the circuits from an over-voltage situation. It's possible there was a transient under-voltage during the jumping. I would try to cold restart your electronics....disconnect the battery....short out the load + and - connectors for about 15 sec (drains any capacitors that preserve supply voltage). Then reconnect battery, giving 2 minutes for computers to restart before testing the blower fan. Have to reset the clock. Have to reset the power windows for auto-open and close.
I assume you've checked any fuses that deliver power to the blower.
If all else fails, there is a great video posted on "volvosweden"'s YouTube channel, showing step by step how to replace the blower fan:
https://www.youtube.com/watch?v=z-9SKu49LBE
2013 XC70 T6 Flamenco Red (hers)
2015 XC70 T6 Seashell Metallic (his)
past: 13 Volvos going back to '74 242 sedan
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