the 1100th blower question

[Andyc5337]

Ok, new guy here so don't flame. I just bought a 2001 XC70. The blower isn't pushing any faster than the lowest speed (pos 1). I can run it all the way up but no change in speed. But if I switch to the left (off) there is a change (no more air at all). The car has 70k on it and I haven't looked yet to see what condition the pollen filter is in. I'm wondering if anyone has experienced these things to just start working with a new filter? Does anyone think it could just need a resistor and can I try or is it even worth it to try just replacing the resistor.
Thanks...

[JRL]

Probably the blower not the resistor but you should change both at the same time...if that's determined to be the problem

[Andyc5337]

I spoke with a tech at Ipd and he indicated that it could be the switch as well. The switch is getting power (all the lights work) but perhaps it is broken??? Is there a diagnostic test I can do to determine which of these parts has failed?