What causes a blower motor to not come on?
It has a fusible link (shared with a ton of stuff), a fuse, power delivered through the relay to the blower. Your only probable failures are blower fuse, relay, relay fuse. With all checking out OK, it would appear that there may be a wiring issue between the relay and the blower. This is fairly uncommon however.
Where are the fuses on a blower motor?
In the drivers end cap there will be two large green fuses just outside of the main fuse area, these are both 30A fuses, check these fuses visually by removing them (specifically #6) Okay #20, 7.5A? We are running low on options here….. last thing to check on the power side is the relay
What to do if your blower fan wont come on?
Using a piece of scrap wire, we want to supplement a ground to the motor, expecting the transistor or ac ecu to be not supplying ground. To do this, we will take a piece of wire and back feed it into the blower fan connector on the — terminal ( |– ) then attach it to ground briefly (you can use the door check bolts in the door jam
Why does my blower motor make a squealing noise?
The squealing noise happens most often in the winter during cold startups and may disappear as the motor heats up. If you ignore the noise, the bearing will continue to wear to the point where the motor won’t start at all. The reason I’m not including the motor resistor as a suspect is because it usually only controls the lower speeds.
How to test a blower motor with a multimeter?
Take out the car’s blower motor relay. Read the grounded relay with your multimeter (Ohm scale). Then check the current pin while not grounding it to the multimeter’s DC scale.
What should I do if my blower motor is not working?
If it’s good, refer to a wiring diagram for your vehicle and conduct these tests: Disconnect the electrical connector at the blower motor and jumper power and ground to the motor, bypassing all the speeds controls.
Why does my blower not work at high speeds?
Blower works on slow speeds, but not on high speed. Check for bad fuse or bad high speed relay. Swap the high speed relay with another relay with the same part number. Also, check the fuse for the control side of the high speed relay. Make sure the ground side of the high speed relay is working. Blower works on some speeds but not others
What kind of motor does a variable speed blower use?
Variable speed blower motors don’t use a blower motor resistor. Instead they use a blower motor speed control or a power transistor. Variable speed motors are most often used in vehicles with automatic climate control.
What are the symptoms of a bad blower motor relay?
3. Melted relay. Another more serious symptom of a problem with the blower motor relay is a burned or melted relay. Relays are exposed to high current loads and can sometimes get hot when they develop problems.
Why is the blower motor not working on my car?
My car has an automatic transmission. Hi There, The resistor is what controls the speed of the blower motor, not the relay. The blower motor relay supplies power to this motor when you turn the switch to “on” that can sometimes fail. When this happens, you may notice that you will not feel anything blowing out of the vents at all.
Why is the resistor not working on my blower?
Hi There, The resistor is what controls the speed of the blower motor, not the relay. The blower motor relay supplies power to this motor when you turn the switch to “on” that can sometimes fail. When this happens, you may notice that you will not feel anything blowing out of the vents at all.
3. Melted relay. Another more serious symptom of a problem with the blower motor relay is a burned or melted relay. Relays are exposed to high current loads and can sometimes get hot when they develop problems.
How does the speed of a blower motor work?
This means that the current running through the blower motor, and its’ speed is therefore controlled by the resistor value. The user chooses a fan speed by selecting a speed which then connects one of the resistors in the blower resistor pack.
How can I tell if my blower motor relay is bad?
Check power to the blower motor relay. If there is power into the blower motor relay, but no power to either the blower motor resistor or the blower motor itself, then the relay is bad. If there is no power to your blower motor relay, check your blower motor fuses.
How do you fix a blower motor on a car?
Disconnect the electrical connector at the blower motor and jumper power and ground to the motor, bypassing all the speeds controls. Run a fused jumper from the battery to the power side of the motor and connect a temporary grounding jumper to the other motor terminal.
It has a fusible link (shared with a ton of stuff), a fuse, power delivered through the relay to the blower. Your only probable failures are blower fuse, relay, relay fuse. With all checking out OK, it would appear that there may be a wiring issue between the relay and the blower. This is fairly uncommon however.
Using a piece of scrap wire, we want to supplement a ground to the motor, expecting the transistor or ac ecu to be not supplying ground. To do this, we will take a piece of wire and back feed it into the blower fan connector on the — terminal ( |– ) then attach it to ground briefly (you can use the door check bolts in the door jam
Where is the blower control switch on the dashboard?
The blower control switch on the dashboard controls the circuit flow of the blower motor to adjust the voltage from low, to medium, to medium-high, to high. When on high, the circuit bypasses the blower resistor.
When do you need to replace the blower motor relay?
If the blower motor does not function, car fuses are blown, or relays are melting, you may have to replace the car blower motor relay. 1. Blower motor does not function 2. Blown fuses 3. Melted relay The blower motor relay is the electrical switch that is used to supply the power for the vehicle’s blower motor.
Where can I get a new blower motor resistor?
I replaced the blower motor resistor and the control unit with new parts from rockauto (ACDelco). I’ve checked the fuse in the dash fuse panel and it is good.
If the blower motor does not function, car fuses are blown, or relays are melting, you may have to replace the car blower motor relay. 1. Blower motor does not function 2. Blown fuses 3. Melted relay The blower motor relay is the electrical switch that is used to supply the power for the vehicle’s blower motor.
In the drivers end cap there will be two large green fuses just outside of the main fuse area, these are both 30A fuses, check these fuses visually by removing them (specifically #6) Okay #20, 7.5A? We are running low on options here….. last thing to check on the power side is the relay
What causes a fuse to blow on a blower motor?
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 causes a bad or failing blower motor relay?
Blown fuses. One of the first symptoms of a bad or failing AC blower motor relay is a blown AC blower motor relay circuit fuse. 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…
Where are the wires on a Volkswagen blower motor?
Two underneath on both lower corners. Two are visible in the upper corners when you open up the glovebox door. There’s a fifth one inside on the back wall of the glovebox. Slide the glove box out slowly – you’ll need to unplug the wires to the light .
Where is the blower fuse on a Dodge PDC?
Haynes say it is located in the PDC under the Hood, along with a 40 amp blower fuse in the PDC. Dodge owners manual shows the 40 amp blower fuse, #25, but does not mention any blower relay in the PDC. All the relays in the PDC have designated legends on the cover, but none indicate they are for the front blower relay.
Can a blower motor resistor fail in a BMW?
If the resistor isn’t working properly, then you’ll experience concerning and inconvenient symptoms in your BMW’s cabin. While blower motor resistor failure isn’t unique to BMWs, they still tend to experience them more than some other vehicles.
What happens if you have a bad blower motor?
The blower motor is the component responsible for pushing air through the vents of your vehicle’s heating and air conditioning systems. Without it, the AC system will not be able to circulate any heated or cooled air.