get access to the blower motor and check voltage at the connector before trying different things.
if you have voltage then it's likely the motor, if not then could be something else

Hi, I have a 2005 2.4 petrol v70 Over the last few months I've had issues with jerky acceleration which have been getting worse. It mainly affects the car going up hill or under load (so when fuel demand is highest I guess) When going uphill with foot to the floor, when I hit 3k rpm, the acceleratio...