Question: How do you check a blower motor resistor?

How do I know if my blower motor resistor is bad?

The most common symptom of a failed blower motor resistor is when the heater fan only runs at the highest speed setting (4 or 5) and doesn’t work at low speeds. In some cars, a failed blower motor resistor can cause a heater fan to stop working completely.

Why does my blower motor resistor keep blowing?

A resistor blows because too much current is going through it. You could try diagnosing the circuit to work out if there’s a fault somewhere else – or you could just fit a beefier resistor.

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.

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.

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Can you fix a blower motor resistor?

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.

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.

Do blower motor resistors 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. Yet, being an open element resistor with no insulation it can tolerate getting hot.

What causes a resistor to go bad?

A fixed composition resistor normally fails in an open configuration when overheated or overly stressed due to shock or vibration. Excessive humidity may cause an increase in resistance. A variable composition resistor may wear after extensive use, and worn away particles may cause high resistance short circuits.

What are the symptoms of a bad blower motor?

What Are Signs Your Blower Motor Needs to Be Replaced?

  • Poor or Airflow from Air Vents. This will be the first and most obvious sign your blower motor has a problem. …
  • No Airflow At All From Vents. …
  • Skyrocketing Energy Bills. …
  • Strange Noises When You Turn on the Heat. …
  • Overheating Blower / Weird Smells.
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What does a final stage resistor do?

The final stage (or blower motor) resistor controls the speed of the blower motor in your heating & air conditioning system. Faulty resistors can cause a list of erratic issues, from the fan running when the car is off, to only having one fan speed available.