Volvo Repair Questions? Ask a Mechanic for Answers ASAP
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The most likely cause of the problem you have is the heater fan resister pack, this has its own feed and if shorting out internally it can continue to feed the fan even after the ignition is turned off.
The relay is in an awkward position up under the dash near to the heater fan. You should be able to locate it by following the wires back from the blower motor.
The fuse to control the blower is number 3 in the facia fusebox and by removing this the blower should stop.
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Not a pain at all, If you can see the two main wires going into the blower you need to follow them back and up to the resister pack, then its the resister pack you need to unplug / replace.
You may need to remove the glovebox to gain access as it is tight.
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