Blower Motor Resistor Specifications

April 20, 2024 Post a Comment

Blower motor resistor specifications

How Many Ohms Should A Blower Motor Have? A good blower motor is expected to read over 0.5 Ohms.

How do you test a blower motor resistor with a multimeter?

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.

Is there a way to test a blower motor resistor?

If you want to do a quick test of the blower resistor, you can check the resistance of each of the resistors with a multimeter as follows: set the tool to read ohms (a measurement of resistance) and connect one of its probes to the common output terminal of the resistor.

How many volts does a blower motor need to run?

A blower motor should receive between 12 and 24 volts of power in order to operate properly.

How can you tell if a blower motor resistor is bad?

Here are some common signs that your vehicle's blower motor resistor is bad:

Loss of HVAC fan control (total or certain speeds)
The fan only works on its highest speed setting.
No air coming from vents.
Intermittent or inconsistent fan speed.

What happens if resistor is too high?

When a resistor has been overloaded with voltage exceeding its power rating, the resistor will become very hot to touch, darken considerably and possibly even melt or catch on fire.

How do you know if a resistor is good or bad?

After connecting the probes to the resistor terminals, check the value on the multimeter. If the resistor is fine, the multimeter will show its value in Ω, kΩ, or MΩ. However, if the resistor is bad or damaged, the multimeter may display 0 or 1.

How many ohms should a fan motor read?

A good motor should read less than 0.5 ohms. Any value greater 0.5 ohms indicate trouble with the motor.

How do you know if a resistor is working?

Testing a Resistor with an ohmmeter is the best, easiest and most effective way to tell whether a resistor is good or not. To set up for the check, we take the ohmmeter and place its probes across the leads of the resistor. The orientation doesn't matter, because resistance isn't polarized.

Will a blower motor work without the resistor?

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 long do blower resistors last?

How long should a blower motor resistor last? While a blower motor resistor is built to last for the car's lifespan, you can expect it to last for 10-15 years, but it's possible for them to last longer or shorter depending on the climate, driving habits, and quality of the resistor.

What causes a blower motor resistor to burn out?

Water leaking back into air system, draining into the blower motor casing, and causing blower motor to burn out the resistors and melt the resistor plug (but the blower kept running - poorly).

Can I running a motor with a lower voltage?

Operating a motor at a voltage below nominal generally has no detrimental effect on performance. In fact, running a motor at lower than nominal voltage (and, therefore, slower than nominal speed) can result in less brush and commutator wear (for brushed motors), lower current consumption, and longer motor life.

How much power does a blower motor use?

A standard fan motor will typically use about 400 watts per hour while a variable-speed model will only use 75 watts per hour.

Should a blower motor have continuity?

The first step is to insure that there is continuity between the three terminals. Check black to white, black to red, and red to white. All should have continuity. Then check resistance.

How do you fix a blower motor resistor?

How to Replace a Blower Motor Resistor

Step 1: Remove the glove box door, if necessary.
Step 2: Disconnect the wiring harness and remove screws. ...
Step 3: Remove and replace the blower motor resistor. ...
Step 4: Tighten screws and reattach wiring harness. ...
Step 5: Reinstall the glove box door.

Does a blower motor resistor have a fuse?

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.

Can a bad blower motor resistor cause no AC?

If the airflow from the vents is weak… A damaged blower motor resistor will work on one fan speed which may not be enough to keep the inside of your car cool or warm enough.

What happens if resistor is too low?

If the resistance value is too low, a high current will flow through the pull-up resistor, heating the device and using up an unnecessary amount of power when the switch is closed.

What size resistor do I need?

We'll use the following formula to determine the resistor value: Resistor = (Battery Voltage – LED voltage) / desired LED current. For a typical white LED that requires 10mA, powered by 12V the values are: (12-3.4)/. 010=860 ohms.