What is a blower motor switch?
The blower motor switch is a switch that lets you control your car’s HVAC (heating, ventilation, and air conditioning) system. Here’s how it works. The blower motor forces hot or cold air from the heater core or air conditioning into the passenger cabin.
You control the temperature and airflow by adjusting the blower motor switch. Most switches are labeled with numbers and symbols so that you can set a comfortable temperature inside the cabin.
How do I know if my blower motor switch is bad?
If the heating and cooling in your car act up, even a little, there’s probably something wrong. Here are the most common signs of a bad blower motor switch:
The heating or air conditioning doesn’t work
The heating or AC works sometimes, but not always
The switch only works on certain settings
The switch is stuck on one setting
The switch is cracked or broken
Keep in mind: Sometimes, it’s obvious that the switch is bad, while other times, a mechanic will need to inspect the HVAC system to determine if the switch needs to be replaced.
How often should a blower motor switch be replaced?
In theory, the switch should last the vehicle’s lifetime. But, the switches are used so much that they frequently wear out. Plan on replacing a blower motor switch when it starts performing erratically.
Keep in mind that the blower motor switch is not inspected as part of a routine maintenance checkup. If you think the switch is bad, make an appointment to get it inspected.
Can I replace my blower motor switch myself?
This is a job best left to the professionals unless you have extensive DIY skills in electrical and computerized systems. It’s essential that a technician makes the diagnosis so you don’t damage the car’s circuitry (or break off your dashboard’s trim when replacing the part).