When a car is shut off, all electrical systems and components are supposed to stop working. In other circumstances, however, the blower motor continues to operate even when the engine is turned off. This odd phenomena may generate worries about potential electrical faults or breakdowns. Why the blower motor blows when car is turned off?
The persistence of the blower motor after shutting off the car is frequently due to a combination of circumstances. The presence of residual power in the system is a common cause. Modern vehicles frequently contain systems that allow certain electrical components to stay active even after the engine has been turned off. Furthermore, a bad ignition switch or a faulty blower motor relay can allow the blower motor to run even when it should be turned off.
While this issue may not always imply a significant concern, you should investigate it immediately now. Understanding the causes of this post-engine shutdown behavior is critical for vehicle owners. Because it aids in the effective operation of the vehicle and eliminates unneeded worry.
What Is A Blower Motor?
A blower motor is an important part of a car’s heating, ventilation, and air conditioning (HVAC) system. It is in charge of creating the airflow required to cool or heat the interior of the vehicle. Furthermore, it provides a comfortable environment for the occupants. The blower motor is usually found within the HVAC system and is linked to the ventilation ducts.
The motor is made up of an electrically powered fan that draws in outside air or recirculated air within the vehicle. The air is subsequently sent through the HVAC system, including the heater core or air conditioning evaporator, where it is heated or cooled. The speed of the motor can be changed to manage the volume and intensity of the airflow.
Blower motors can be operated by either direct current (DC) or alternating current (AC), depending on the electrical system of the vehicle. They are controlled by the HVAC controls in the vehicle, allowing the driver or passengers to modify the fan speed and airflow direction.
Reasons Why Blower Motor Blows When Car Is Turned Off?
Many vehicle owners are perplexed when a blower motor continues to run after the engine has been shut off. However, this can happen for a variety of reasons. Here are some common reasons why a blower motor blows when the engine is shut off:
Blower Motor Delay
A blower motor delay feature is available on several automobiles. This delay is intended to keep air moving for a brief time after the engine is turned off. It dissipates any residual heat from the engine throughout the cabin, reducing potential overheating problems. The duration of the delay varies based on the vehicle model and might range from a few seconds to a few minutes.
Evaporator Core Cooling
In some vehicles, the blower motor continues to run to cool the evaporator core of the air conditioning system. During regular operation, the evaporator core might build frost or ice. Keeping the blower motor running helps melt this ice and keeps it from interfering with the system’s overall operation.
HVAC System Calibration
Certain automobiles use blower motor operation to calibrate the HVAC system. By continuing the blower motor after the engine has been switched off, the system adjusts and remembers the settings for the next time the car is started. This calibration guarantees that the HVAC system maintains the desired settings on a consistent basis.
Malfunctioning Controls or Relays
In some circumstances, the continuous activity of the blower motor after the car has been shut off could be attributable to a faulty control module or relay. Electrical faults within the HVAC system may disrupt regular control operation and cause the blower motor to remain engaged. If this is suspected, it is best to have the vehicle inspected by a certified mechanic to diagnose and address the issue.
Finally, the causes are frequently caused by a blower motor delay, evaporator core cooling, HVAC system calibration, or electrical problems. While this behavior may appear weird at first, it is a normal feature to ensure maximum performance. However, if there are any worries or the blower motor continues to run indefinitely, it is best to get professional assistance to ensure the HVAC system is operating properly.
How To Fix Blower Motor Blows When Car Is Turned Off?
If your car’s blower motor continues to blow after you turn off the engine, follow these procedures to resolve the problem:
Check The Blower Motor Delay
Begin by ensuring that the blower motor delay is working properly. After shutting off the engine, wait a few minutes to observe if the blower motor eventually stops. If it continues indefinitely, there may be a problem.
Inspect The Hvac Controls
Check that your vehicle’s HVAC controls are in good working order. Make that the fan speed control is set to “off” and that the temperature and airflow parameters are correct. Faulty controls can cause the blower motor to remain engaged.
Check For Electrical Issues
Examine the electrical connections and wiring related to the blower motor. Look for any loose or damaged wires, connectors, or relays. If you have the requisite knowledge and skills, you may be able to handle small electrical issues on your own. Otherwise, it is best to visit a certified mechanic.
Seek Professional Assistance
It is preferable to take your vehicle to a trained mechanic if you are unable to detect or resolve the problem on your own. They will have the knowledge and diagnostic instruments necessary to properly diagnose and fix the blower motor problem. They may need to inspect the HVAC system, test the blower motor, and make any repairs or replacements that are required.
The exact measures to resolve the issue will vary depending on the make, model, and year of your car, as well as the underlying cause of the problem. Working on a vehicle’s electrical components can be complicated and even dangerous.To ensure appropriate troubleshooting and repair methods, consult the vehicle’s owner’s manual or seek professional assistance.
How Much Does It Cost When Repairing A Bad Blower Motor?
The cost of fixing a blower motor depends on a number of factors. They are the vehicle’s make and model, the level of the damage or malfunction, and the precise components that must be replaced.
A blower motor repair might cost between $150 and $500 on average. However, this is only an estimate; the actual cost may be greater or lower based on the aforementioned criteria.
If the problem with the blower motor is minimal and can be fixed by fixing a specific component, the cost may be on the cheap side. However, if the complete blower motor assembly has been replaced, the cost can be higher.
Additionally, labor fees for the repair will be included in the total cost. The cost of labor varies based on the repair shop or dealership where the work is done.
To obtain an exact cost estimate, contact nearby vehicle repair shops and give them with the necessary information. Based on their knowledge and local market prices, they can provide you with a more specific quote.
Final Thoughts
If a blower motor continues to operate after a vehicle has been shut off, this is often normal behavior or an intentional design feature. A blower motor delay to remove remaining engine heat or HVAC system calibration are examples of this. However, if the blower motor continues to run indefinitely or displays signs of breakdown, the problem must be addressed. Repair charges vary according on the vehicle and the degree of the repair. You can assure optimal HVAC system performance by knowing the reasons and taking suitable action.