The blower motor circuit is generally protected by a located in the PDM, often labeled as F2 .
If you're experiencing issues with your Freightliner M2's blower motor, here are some troubleshooting tips to help you identify the problem: Freightliner M2 Blower Motor Wiring Diagram
Before reading the diagram, you need to identify the key players: The blower motor circuit is generally protected by
Typically a ~5V signal used by the HVAC controller to monitor motor operation. Pin 3 (Ground): Freightliner M2 Blower Motor Wiring Diagram