Sorry 'bout that. 240 Blower motor replacement is a sort of rite of passage.
Fan speed #4 is direct, no resistor in the circuit. So if it will run in speed #4, failure is in the resistor unit.
The challenge with the blower motor replacement job is that so many little parts (big ones, too) have to come out to get at the motor. That means having ways to tag or bag them, to have a chance at getting things back correctly. One BB'er took photos after certain steps.
Not a lot of different tools are needed, no special tools. Getting the clips off the turbine housing halves takes some ingeniuty, as does the removal of the turbines from the motor shaft. Also, the rubber things that hold the defroster ducts in place is likely brittle, so be careful there. Again, use ingenuity.
My turn at that job was before the advent of the BB, but I had a copy of the Volvo instructions, fortunately. Back then the dealer quote was $105 USD for the motor and 5 hours labor.
The 5 labor hours are likely the same, but the dealer rate is now $100 an hour. Thus the incentive to learn the DIY methods. Also the motor and resistor can be obtained at a better price. Quality counts in this one, once a car is enough.
Good Luck,
Bob
:>)
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