The blower motor is
usually under the dashboard on the passenger side
. Blower motors that make loud squeaks or rattling noises may be worn out and on the verge of packing it in, but sometimes those noises are caused by leaves or other debris that can be cleaned out after the motor is removed from the vehicle.
How do you know if your heater fan is going out?
You might also
hear ongoing whirring noises
, or noises that change or get louder if you increase the fan speed. These are all signs of problems with the blower motor. In some cases, you may even notice smoke or smells of burning while driving, in which case you should pull over immediately.
How do I know if my heater blower motor is bad?
- Poor or Airflow from Air Vents. This will be the first and most obvious sign your blower motor has a problem. …
- No Airflow At All From Vents. …
- Skyrocketing Energy Bills. …
- Strange Noises When You Turn on the Heat. …
- Overheating Blower / Weird Smells.
What causes a heater fan to stop working?
Blower motor resistor / control
module problems
In some cars, a failed blower motor resistor can cause a heater fan to stop working completely. In most cases, a blower motor resistor fails due to corrosion or overheating.
What are the signs of a bad blower motor relay?
If you have a faulty blower motor,
you may experience low airflow from the vents
, even when the fan is on high. There will be no air coming from the vents if your fan isn't working due to a bad blower motor resistor.
How do I know if my fan motor is bad?
- The fan won't start even though the AC is on. …
- The fan continues to run, even when shutting off the AC. …
- The fan is on but rotating very slowly. …
- The fan runs intermittently. …
- There's a rattling or buzzing noise coming from the condenser unit when the fan is turned on.
What does a bad blower motor sound like?
You might hear this as a noise coming from directly behind the vent, perhaps
a light slapping
, or a sudden pop before you notice a problem with airflow. Whirring noises might also result from a bad bearing in the motor. … This is a telltale sign of a bad blower motor.
Why is my furnace running but not blowing hot air?
Furnace overheating can be the cause of your cold air dilemma.
Changing the dirty air filter
can solve this problem. The dirty air filter blocks the airflow, causing the furnace to run longer to heat your home until it overheats. It is important to note that constant overheating can damage your heat exchanger.
What to check if heat is not working?
Check your power source—a tripped circuit breaker or blown fuse could be the reason for your furnace failure. Reset your breaker or replace the fuse to see if that restores heat.
Check your filter
—if it's so dirty that your system is struggling to move air through it, your furnace could overheat and shut down.
Why is my car blowing cold air when the heat is on?
Problems with the vehicle's heating system can be either no air or only cold air coming out of the heating system. A car heating system blowing cold air can be due to
a faulty thermostat, low coolant fluid level
, malfunctioning heater core, a leaking cooling system, or problems with heating controls and blend door.
What are the symptoms of a bad thermostat?
- Leakage from the mounting surface. Appearance: Seepage, drips or large coolant bleed marks on or around the mounting surface or on the housing. …
- Rust and corrosion. Appearance: Rust and corrosion on the surfaces of the thermostat. …
- Deposit build-up. …
- Map-controlled thermostats.
What happens if blower motor relay goes bad?
If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may
cause the blower motor fuse to blow
. Any sort of electrical spikes or excessive current from a bad relay will blow the fuse and cut power in order to protect the system.
What happens when blower motor resistor goes bad?
If the resistor shorts or fails,
it may cause the blower motor to remain stuck on one fan speed
. The heating and air conditioning systems may still function at one speed, however the resistor will have to be replaced in order for full functionality to be restored.
Is there a fuse for the heater blower?
If the fan doesn't work, before pointing the finger at the blower motor, check fuses for the motor to make sure they're still good. …
Many vehicles have two fuses for the blower
motor, one in the interior fuse block and the other under the hood.
What causes fan motor failure?
The main causes of failure are
loss of lubricant, a failed run capacitor, a failed bearing in a belt drive, a little water dripping into the windings or a voltage problem
. So technicians should carefully check to find the cause of a failure before changing the motor.
What happens when condenser fan fails?
When the condenser overheats, all of the components of the AC system will begin to overheat until they eventually get hot enough to burn and emit an odor. … A failed fan will not only fail to
produce cold air
, but can even result in damage to the AC system due to overheating.
