Best answer: Why does my blower motor resistor keep burning out?

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. … Then they buy a aftermarket blower motor and again it keeps burning up.

Can you bypass the 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. … A blower motor resistor or a blower motor control module is the part that controls the speed of the blower motor.

What are the signs of a bad blower motor resistor?

What are the symptoms of a bad blower motor resistor?

  • No Air. …
  • High speeds only. …
  • Low speed only. …
  • Fan won’t turn off. …
  • Blower motor works on some settings but not others. …
  • Smoking vents. …
  • Burning smell.

Should a blower motor resistor get hot?

Re: How hot is a blower motor resistor supposed to get? Yes that resistor will get very hot. Most people don`t know this but it is faster to defrost the windshield on low or medium fan speed due to that resistor putting off heat. Also that resistor needs to be cooled off with the air flow or it will burn up .

IT IS INTERESTING:  Question: Are brushless motors more efficient?

Is there a way to 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.

How do you bypass a cooling fan resistor?

The resistor just gives you the low speed fan. You can simply bypass by unplugging the two wires connected to it and connect those together. The result will be that when the low speed fan is called, you will get the full speed fan. It will not run all the time.

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

Blower Motor Resistor Replacement Cost – RepairPal Estimate. The average cost for blower motor resistor replacement is between $115 and $141. Labor costs are estimated between $47 and $59 while parts are priced between $68 and $82. This range does not include taxes and fees, and does not factor in your unique location.

How do you diagnose a bad blower motor?

Symptoms of a Bad or Failing Heater Blower Motor

  1. 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. …
  2. 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. …
  3. No air from the vents.

What will a bad blower motor resistor do?

A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed.

IT IS INTERESTING:  What is the benefit of manual transmission?

Is there a fuse for the blower motor?

The blower motor is powered by a fuse-like device called a relay. … While replacement is easy, the exact location of your blower motor fuse may vary from vehicle to vehicle.

What causes resistors to burn?

Burning of Resistor

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. Although a resistor may appear damaged at this point, it can still be functioning.

How do you know if a resistor is bad?

Your meter will read it as open circuit (infinite ohms). Or maybe it’s a 0.1 ohm current sensing part. Your meter will read it as a short circuit. If it’s a larger resistor with leads and it looks and smells burnt, assume it’s bad.

Car service