Just went through this ordeal with my R129 but should be similar to yours. Process of elimination but you need to know where to start so here's your starting point. Your problem is most likely the blower resistor. The resistor is located very near the blower itself and is bolten down to a heat sink. Before you start buying parts, take out the blower assembly and test the blower without the resistor. If the blower works, then you can rule it out as the culprit. Next test the blower and resistor. If the blower doesn't turn on, then you know that the resistor is the problem. The problem is that the resistor is often more expensive than the blower itself. Hope this helps.