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 relay for the blower motor?
The blower motor relay is generally located in the under-hood fuse box or in the under-dash fuse box . A blown fuse can mimic relay failure. A failed blower motor switch can also give many of the same symptoms.
What can cause a blower motor relay to go bad?
Essentially an on/off switch, the blower motor relay's reactions start and end the heating process in HVAC systems by controlling the flow of current between the power source and the motor . Blower motor relays tend to wear out over time from the stress of constantly flicking back-and-forth.
How do I know if my blower motor module 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.
How do you test a blower motor relay?
- 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.
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.
What can cause a blower motor to stop working?
In a situation where the motor doesn't work on any speed, the most likely causes are: a blown power supply fuse , a bad motor ground connection, bad motor speed control module or a failed motor. On all systems, a failed blower motor is least likely.
How much is a blower motor relay?
Blower Motor Relay Replacement Cost – RepairPal Estimate. Labor costs are estimated between $37 and $46 while parts are priced at $37 . This range does not include taxes and fees, and does not factor in your specific vehicle or unique location.
Is there a fuse for the blower motor?
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. The blower motor is usually under the dashboard on the passenger side.
How do you test a blower motor?
- Use voltmeter or ohmmeter to check for a blown fuse. If you find one, replace it.
- Start car and see if blower motor works. ...
- If the circuits are in good repair but the blower motor keeps blowing fuses, replace the blower motor [source: You Fix Cars].
How much does it cost to replace a blower motor resistor?
The average cost for a Blower Motor Resistor Replacement is between $108 and $137 but can vary from car to car.
What does a bad blower motor sound like?
A defective blower motor will make a continuous sound noticeable by the passengers in the vehicle. It can manifest as a knocking, whirring, clunking, vibrating, squealing, or whining noise that persists until the blower motor is replaced.
How much does it cost to replace a blower motor?
Replacing a blower motor costs $450 on average with a typical range of $250 to $800. With a warranty, you might pay as little as $150 for labor alone. For high-end models, like those with large motors or access issues, you might pay as much as $2,000.
Can a blower motor be repaired?
Blower Motor Replacement: When Good Parts Go Bad. ... There are a number of things that can go wrong with your heating system, but if the air stops blowing altogether and the same is true on cold air settings, a blower motor replacement is likely in order. The good news is that it's a fairly straight forward repair .
How do I test a blower motor resistor?
Place one lead of the Ohmmeter on terminal 1 of the resistor. Place the other lead on terminal 2 and check against specifications. If this circuit is open, showing infinity on the Ohmmeter, the blower resistor must be replaced. Move the lead from terminal 2 to terminal 3 and check this reading against specifications.
