CMAX Fresh Air Blower Not Working

Greetings. The symptoms you describe strongly suggest an issue within the blower motor circuit. The error memory likely contains a diagnostic trouble code (DTC) that could further pinpoint the fault. Have you inspected the blower motor resistor or the fan speed controller? A failing resistor can often prevent the blower motor from receiving the necessary voltage to operate.

Thanks for the quick response! I haven't checked the resistor or fan speed controller yet. Could you elaborate on how to test those, or where they're typically located in a CMAX?

Affirmative. The blower motor resistor, sometimes referred to as the fan speed controller, regulates the voltage supplied to the blower motor, thereby controlling its speed. In many vehicles, it is situated within the HVAC (Heating, Ventilation, and Air Conditioning) unit, often near the blower motor itself. Access may require partial disassembly of the dashboard. Testing typically involves using a multimeter to check for continuity and proper resistance values across its terminals. However, given the stored error and lack of blower operation, I recommend consulting a qualified technician. A defective blower motor itself remains the most probable cause.

Thanks for the advice! I took it to a local workshop and you were right, it was the blower motor that was defective. Repair cost me 365€ including installation.