heater blower motor

Does not work at any speed, where is it and its dropping resistor

It under the dash above the passenger foot area. The resister is next to the firewall and goes up next to the squirl wheel. I've changed resisters on both of the on N body GM's I own.

Does not work at any speed, where is it and its dropping resistor

If it does not work at any speed, then it is not likely to be the resistor. Check the system relay, under the hood in the Electrical Distribution Center (I think), or the Blower Motor itself, located under the dash on the passenger side by the resistor.