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I believe what they did was hit the motor. With a failing window motor, blower motor, fan motor, fuel pumps, etc, you can often get them to work again temporarily by turning it on and then smacking it with a mallet or hammer. Window motors are probably the most common thing to do this with. I believe what they probably did was tap on the blower motor with something to jar the brushes and get it working again. Until you're able to get the motor replaced you can try it again, turn the key on and blower on, use something to get in and tap on the motor or heater box in that area and see if it will start working again.