The details you give are too vague to provide a definite answer,and if in ANY doubt seek advice from a local appliance repair shop.
The majority of vac motors are brush type.Any capacitor in circuit probably a suppressor.If it IS an induction motor consult a local electrician. If the switch has 4 terminals probably a two pole type In that case live & neutral to one side of the switch,the motor leads connect to the other side.If only 2 terminals on switch then it would be single pole,in which case the live lead switched and the neutral direct to motor.But as above cannot be more specific