How do you test a GM blower motor resistor?

OK, these are the test steps:

Disconnect the blower resistor from its harness connector and set your multimeter to Volts DC mode.
Turn the key to the on position and set the blower speed knob to LO.
With the key in the on position and the blower speed knob to M1.

Also asked, how do you 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.

Additionally, how do you know if a resistor is bad? Set a digital multimeter for "ohms." Set an ohms range that is equal to or higher than the value of the resistor to be tested. Touch the red lead from the meter to one side, and the black lead to the other. Resistors do not hold a polarity, so it doesn't matter which side gets the red or black lead.

Subsequently, one may also ask, how do you troubleshoot a blower motor resistor?

How to Troubleshoot a Blower Motor Resistor

Locate the fuse for the blower motor in the owners/service manual.
Unplug the blower motor and test for power using the 12-volt test light in the same manner as explained in Step 1.
Test for ground at the blower motor if there is power indicated at all ranges, but the motor does not function.

What are the symptoms of a bad blower motor?

Symptoms of a Bad or Failing Heater Blower Motor

Weak airflow from the vents. One of the first symptoms of a potential problem with the vehicle's heater blower motor is low airflow from the vents.
Fan only blows at certain speeds. Another symptom of a bad or failing heater blower motor is a motor that only functions at certain speeds.
No air from the vents.

What are the signs of a bad blower motor resistor?

Symptoms of a Bad or Failing Heater Blower Motor Resistor

Blower motor stuck on one speed. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting.
Blower motor does not work on certain settings.
No air from the vehicle's vents.

How much does it cost to fix a blower motor resistor?

The average cost for a blower motor resistor replacement is between $118 and $160. Labor costs are estimated between $46 and $59 while parts are priced between $72 and $101.

Does the blower motor have a fuse?

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.

Can you bypass blower motor resistor?

This means that the current running through the blower motor, and thus is speed is controlled by the resistor value. 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.

Why does my blower motor not work?

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. Start by checking the blower fuse and HVAC controller fuse.

What happens when a blower motor resistor goes bad?

If you have faulty blower motor resistor you may experience low airflow coming from the vents even when the fan is all the way on high. In some cases bad blower motor resistor may not even turn the blower motor fan as a result your fan will not work at all and there will be no air coming from the vents.

How long does it take to replace a blower motor resistor?

about 45 minutes

What does a blower motor switch do?

The blower motor is the electrical switch on the interior of a vehicle that allows the driver to control the vehicle's heating and air conditioning system. It is usually built into the the same control panel that houses all of the AC system controls, and is labeled with numbers and symbols to indicate blower fan speed.

How much does a blower motor cost?

How much does a furnace motor replacement cost? On average nationwide, a furnace blower motor replacement costs $400-$600, including parts and labor. A single-speed blower motor costs around $450 to replace while a variable-speed motor costs $600+.

How do you know if your AC relay is bad?

Signs of a Bad or Failing AC Compressor Relay

Inconsistent cooling. The AC compressor is powered by the relay.
AC compressor is not turning on. One of the most obvious signs that the AC relay may have a problem is that the compressor is not coming on at all.
No cold air.

How do I test a resistor?

Steps

Remove power from the circuit containing the resistor.
Isolate the resistor from the circuit.
Inspect the resistor.
Read the resistor value visually.
Prepare a digital multimeter (DMM) to measure the resistor.
Measure the resistance.
Determine the actual resistance of the resistor.

What is a blower motor resistor?

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.