What to know about the Blower Motor Switch:
In your car’s HVAC system, the heater core is what produces hot air to keep the interior warm during cool weather. The air conditioner and its varied components cool the air during the summer. The blower motor is what pushes the conditioned (heated or cooled) air out of the dash and into the cabin of the vehicle. With regards on the make and model of your vehicle, you may have one, two or even three blower motors, each with their own blower motor control.
SEE ALSO:How your Heater Core functions
Essentially, the blower motor switch enables you to regulate the airflow within your vehicle. It lets you set the fan to off, low, medium or high (or a number of other speeds depending on the system in question). After some time and through normal wear and tear, the contacts inside the switch will wear out and it will stop working normally, requiring a new blower motor switch.
Facts to Note:
The blower motor control is not checked during any maintenance service.
Most switches exhibit intermittent behavior before failing completely, so you should have some indication about impending failure.
How to Fix:
The blower motor switch is verified that it needs to be changed. The blower switch trim panel is removed for access.
The defective blower motor switch is disconnected and removed from the trim panel.
The new blower motor switch is installed into the panel and the panel is reinstalled.
The blower motor control is tested for operation on all blower speeds.
The vehicle is inspected to ensure proper A/C and heater operation.
Without a functional blower motor control, you will not be able to control the fan and fan speed for your car’s HVAC system. That could mean anything from being uncomfortable, to being dangerously overheated or chilled depending on the weather conditions. If you are suspicious of your blower motor switch is not working properly, have its operation checked by one of your expert mechanics.
Common symptoms indicating you may need to replace the Blower Motor Switch
Intermittent operation (fan operates in some switch positions but not others, for instance)
Blower motor will not work at all
Importance of this service:
Although a spoilt blower motor switch will not stop you from driving, it is important to be comfortable in your car and have clear, unfogged windows. Have the problem checked and fixed as soon as you can.