To protect the blower motor power circuit,
a 20-, 25- or 30-amp fuse
is usually located in the fuse panel under the dash. The rating of the fuse will depend on the vehicle application and how much power the blower motor requires at full speed.
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.
Where is the fuse for the heater fan?
Many vehicles have two fuses for the blower motor, one
in the interior fuse block
and the other under the hood. The blower motor is usually under the dashboard on the passenger side.
What relay controls the blower motor?
The blower motor relay is the
electrical switch
that is used to supply the power for the vehicle's blower motor. The blower motor is the component responsible for pushing air through the vents of your vehicle's heating and air conditioning systems.
How do I know if my blower motor fuse is bad?
- Fan does not work at all, so no air comes out of the vents.
- Fan only works on some speeds and not others.
- Fan only works on the highest speed.
- Fan runs all the time and can't be controlled with the fan switch.
- You see smoke coming out of the vents.
Which fuse is the blower motor fuse?
Fuse Protection
To protect the blower motor power circuit,
a 20-, 25- or 30-amp fuse
is usually located in the fuse panel under the dash. The rating of the fuse will depend on the vehicle application and how much power the blower motor requires at full speed.
Where is the blower motor fuse and relay?
The blower relay is
located near the front of the fuse block and is labeled “Blower
.” Inspect the center of the relay. If the metal rod inside is broken, the relay will need to be replaced.
Examine the exposed components in the furnace cabinet to locate the blower motor; look for a small silver box positioned toward the top of the cabinet. Mounted just above this box you should
see a small round component with a raised red or white button at the center
; this is the blower reset switch.
How do I manually turn on my furnace fan?
- Move furniture or obstacles away from the warm-air supply register and the cold-air return.
- Locate the household thermostat. …
- Switch the fan setting to “on.” Listen for the sound of the blower turning on.
Why is my truck not blowing hot air?
Faulty Heater
Core
The heater core looks (and works) similar to your car's radiator — it's made up of a series of narrow tubes and fins. … Faulty heater cores and low or contaminated coolant levels often come hand in hand, and both issues may lead to your engine overheating and your heater not blowing hot air.
Is there a fuse for the blower motor?
The blower motor is powered by a fuse-like device called
a relay
. If your heater or air conditioner does not blow air through the vents, this could indicate that the blower motor fuse has probably blown. While replacement is easy, the exact location of your blower motor fuse may vary from vehicle to vehicle.
How do I know if my heater relay is bad?
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.
Where is the fan relay?
The fan relay is located
on the driver side firewall
. It is at the very end where the firewall and left front fender meet. There are two relays in that location, one is the fuel pump relay and one is the fan relay.
Can a blown fuse cause no heat?
A blown fuse is a symptom not a cause
. … If a new fuse blows as soon as the blower is turned on, the heater circuit or motor may have a short that should be investigated. If the fuse lasts a while and then blows, the fan motor is probably running hot due to worn brushes and/or bushings and should be replaced.
What does the HVAC fuse control?
In HVAC systems, fuses are used in compressors, evaporator coils, motors, and wiring configurations. Fuses
guard these components against overheating
. They also serve a vital role in protecting other HVAC parts from overloading. Some HVAC components are designed to complement the function of others and are connected.
Does the blower motor resistor control heat?
The blower motor resistor is an electrical component that is a part of the vehicle's heating and air conditioning system. It
is responsible for controlling the blower motor's fan speed
. … A failed blower motor resistor can cause issues with the operation of the entire heating and air conditioning system.
