Volvo: Heating/ AC fan blower, vacuum leak, fan blower

Question
No, I feel the heat or A/C but only after a very long time. The blower does not turn on at all, or I don't hear it and before I couldn't talk to the person next to me with it on. I am guessing you are going to tell me to try putting in a new blower, right? How do I know that is, for sure, that is problem?
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Followup To

Question -
I own a 1984 DL Volvo and I am recently noticed that when I turn on the heat or A/C after about 20-30 minutes I can feel the air but the fan will not blow the air. Could my fan blower be shot? Or is there another possible problem?

Answer -
Julianne,
So at first the flow of air is strong and it dies out after some time, right? When the air flow stops or slows down can you hear the blower motor running? The blower motors on the 240's have been know to fail. If you hear the blower motor running and it is not not pushing air out any of the vents, you might then have a vacuum leak to the vents preventing them from working or opening.

Answer
Julianne,
The blower motor is a common repair. You can check the fuses for the blower motor and see if power is getting to the fan switch and then from there going to the blower motor. If the motor is getting power and not working then a new blower is needed. When doing that job it is always recommended the switch and resistor be replaced at the same time. I always sell that as a blower motor package. Best way to insure a long motor life.