blower motor resistor specifications, check these out | How much resistance should a blower motor have?

How much resistance should a blower motor have?

According to the service manual, it must be around 4-5 ohms. In our case the ohmmeter shows open circuit, which means the resistor has failed. Sometimes, a blower motor resistor might fail due to problems with the blower motor itself.

Are all blower motor resistors the same?

Blower motor resistors have several resistors with different resistances. This controls the current that runs through the blower motor. Each fan speed selection is connected to one or more of the resistors in the blower resistor assembly.

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.

How do you know if your blower motor resistor is bad?

Here are some of the warning signs of a bad heater blower motor resistor:
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 is blower resistor?

Blower resistors are resistors which are used to control the fan speed of automotive blowers. The fan speed can be changed either by switching the blower resistor resistance mechanically using a rotating lever, or electronically by the air conditioning system.

Can a bad blower motor resistor cause no AC?

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. A blower motor without power will not be able to produce any air pressure, and as a result the heating and air conditioning system will be left with no air coming from the vents.

Why does my blower motor resistor keeps melting?

Trent, one of the biggest reasons for blower motor resistors to have shorten life is actually because of faulty blower motor drawing too many amps, some times melting wires/plugs, heating up resistors shortening their life. Many Dodge forums tell of this problem.

Can a blower motor resistor be repaired?

The average cost to replace the blower motor resistor at a repair shop is between $44 and $55 in parts and $70 in labor costs, for a total cost of around $114 to $125. On the other hand, you can easily fix the blower motor resistor at home in about an hour (even if you’re a beginner) and for around $70.

Why does my blower motor only work on high?

Most car manufacturers use a series of resistors to make the heater blower motor run at different speeds. And when one or more of these resistors burn out, you’re usually left with only one heater blower motor speed—high. The resistor module is easy and inexpensive to replace.

Can I 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 know if a resistor is working?

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.

Is there a fuse for the blower motor?

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.

Can a blower motor resistor work intermittently?

Intermittent Operation

This often presents itself as the blower fan not kicking on until the engine is producing a certain level of electric current. The higher current can make the jump across the resistor contacts that are going bad and get the blower motor to engage.

Does a blower motor resistor get hot?

Yes, it would get hot, but the resistor(s) are often mounted in the air duct near the blower, so the air stream would cool them. If it were outside the air stream or if the air were blocked it would definitely get hot.

Is it the resistor or the blower motor?

Blower resistors are resistors which are used to control the fan speed of automotive blowers. The fan speed can be changed either by switching the blower resistor resistance mechanically using a rotating lever, or electronically by the air conditioning system.