1. Faulty blower motor: The blower motor itself could be faulty, preventing it from functioning properly at lower speeds. Check for any visible damage or obstructions to the blower motor, and test it with a multimeter to ensure it is receiving power.
2. Faulty wiring or connections: There may be an issue with the wiring or connections leading to the blower motor. Inspect the wiring for any damage, corrosion, or loose connections. Ensure the ground connection to the blower motor is secure and clean.
3. Control switch issue: The problem may lie in the blower motor control switch. This switch might not be functioning correctly or might not be sending the proper signals to the blower motor resistor.
4. Climate control module problem: The climate control module (CCM) is responsible for controlling the blower speed based on user input. A faulty CCM might be sending incorrect signals to the blower motor resistor.
To determine the exact cause, you may need to perform further diagnostics with a multimeter and possibly seek professional assistance from an auto electrician or mechanic experienced in automotive electrical systems.
