If you turn on the heat or AC in your car and you only hear a noise without any air coming out, it indicates a problem with the ventilation system. Several possible reasons could explain this issue:
Blower Motor Failure: The blower motor is responsible for pushing the air through the vents. If the motor fails or is damaged, it may produce a noise without actually moving any air.
Blower Motor Resistor Issue: The blower motor resistor controls the speed of the blower motor. If the resistor malfunctions, the motor may not receive the proper signals to operate at different speeds or may not work at all.
Cabin Air Filter Clog: A clogged cabin air filter can restrict airflow and prevent air from reaching the vents. If the filter is dirty or blocked, it should be replaced to restore proper airflow.
Damaged Air Ducts: The air ducts in your car deliver the conditioned air to different parts of the cabin. If these ducts are damaged or disconnected, the air may not reach the vents, resulting in no airflow.
HVAC Control Module Issue: The HVAC control module is responsible for regulating the heating, ventilation, and air conditioning functions in your car. If the module malfunctions, it may prevent the blower motor from receiving the proper signals to operate.
It's recommended to have a qualified mechanic inspect your car's ventilation system to diagnose the exact cause of the issue. They will be able to pinpoint the problem and suggest the necessary repairs or replacements to restore the airflow in your car.