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.
How do I know if my blower motor resistor 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 with a multimeter?
Using a multimeter set on the Ohm scale, use the positive lead and test the
black
wire. To check the purple wire for current, use your ignition key and turn it to the run setting, turn the heater power to full power and set the multimeter to DC power. If your meter reads “no current” the motor is no good.
How do you test a blower motor on a Jeep?
- 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].
Can you bypass blower motor resistor?
In the highest speed state,
the blower resistor is bypassed completely
and the fan is connected directly to the car's battery, which allows maximum current through the motor. Power to the blower motor is fed through the blower motor resistor, so if it fails or has any issues power can be cut off to the motor.
How do I test my 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.
How do you change a blower motor on a 2002 Jeep Liberty?
Open the passenger's side door of the Jeep then the glove compartment door. Access to the resistor is
through the back of the glove compartment
.
What causes a blower motor resistor to burn out?
In most cases, a blower motor resistor fails
due to corrosion or overheating
. Sometimes, the mechanical resistance to the motor rotation causes an excessive electric current that can overheat and prematurely damage the blower motor resistor.
Can you fix a resistor?
Resistors are easy to find if they have become defective because they can be measured with the electronic device turned off. Once
a resistor is found to be defective
, replacing it can return the electronic device to correct operation.
What is the purpose of a blower resistor?
The blower motor resistor is
responsible for controlling the blower motor speed
. In the past, this was done by varying the voltage supplied to the blower motor. In newer applications, the blower motor resistor is actually a solid state module that sends a varied signal to the blower motor.
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.
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.
How do you troubleshoot a blower motor?
- AC Fan Doesn't Start. Even though you have the AC turned on, the fan does not start.
- AC Fan Doesn't Stop. …
- Slow Rotating Blades. …
- Outside Fan Blades Are Still. …
- Rattling, Humming and Buzzing Noises. …
- AC Runs Intermittently. …
- No Cold Airflow.
Is there a fuse for the blower motor resistor?
A fuse is
often located on the resistor board
. The fuse only protects the low and medium blower speeds. High speed will still work if the resistor fuse is blown. On 1996 GM FWD minivans, two blower relays are used (low and high speed).
How do you replace a blower motor resistor?
- Remove the negative battery terminal. …
- Locate the blower motor resistor on the passenger side under the dash board. …
- Disconnect the electrical connector to the blower motor resistor.
- Remove the screws or bolts to the blower motor resistor and remove the resistor.
- Installation is the reverse of the removal.
