How do you replace a heater resistor?

Asked By: Sarbjit Iruzquieta | Last Updated: 6th June, 2020
Category: home and garden indoor environmental quality
4.9/5 (128 Views . 42 Votes)
Difficulty
  1. Remove the negative battery terminal.
  2. Locate the blower motor resistor on the passenger side under the dash board.
  3. Disconnect the electrical connector to the blower motor resistor.
  4. Remove the screws or bolts to the blower motor resistor and remove the resistor.
  5. Installation is the reverse of the removal.

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Simply so, how do you test a heater 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.

Similarly, where is the heater blower resistor located? It's located inside the dash, often on the opposite side of the steering wheel or inside the engine compartment on the firewall. A blower motor resistor or a blower motor control module is the part that controls the speed of the blower motor.

In this manner, what is a heater 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.

How much is a blower motor resistor?

The average cost for a blower motor resistor replacement is between $119 and $161. Labor costs are estimated between $47 and $60 while parts are priced between $72 and $101. Estimate does not include taxes and fees.

37 Related Question Answers Found

Can you repair a blower motor resistor?

Find the blower resistor and detach it from the rest of the circuit. For the precise location, consult the repair manual for your car's make and model. If any of these resistances show an open circuit (infinite resistance), then the blower resistor needs to be replaced.

Where is the blower motor relay?

Locate your vehicle's blower motor relay. In the vast majority of vehicles, you can access the relay through the glove compartment.

What does a resistor do?

A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses.

What do u mean by resistor?

A resistor is an electrical component that limits or regulates the flow of electrical current in an electronic circuit. Resistors can also be used to provide a specific voltage for an active device such as a transistor.

Why does my car AC only work on high?

When a blower resistor fails, the highest fan speed usually is the only one that still works because it essentially bypasses the resistor and receives the maximum amount of voltage. When the resistor is working, it reduces the amount of voltage going to the lower fan speeds, so the fan runs slower.

What causes heater resistors to burn 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.

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.

Why do fans stop working?

Check the Fan Fuse
Like the circuit breakers in your house, these fuses are designed to break the electrical connection when too much electricity causes your fan to overheat. When the fuse melts, it breaks the connection and cuts power to the fan. Check the cord and the inside of your fan for this fuse.

Can you test resistors in circuit?

Turn the multimeter dial to the resistance setting. Power off the circuit containing the resistor you wish to measure. Never measure a resistor in a circuit with a live current running through it. A bad resistor will either show infinite resistance or a measurement far higher than its rated resistance.

How much does a blower motor cost?

The average cost for a blower motor replacement is between $363 and $394. Labor costs are estimated between $87 and $111 while parts are priced between $276 and $283. Estimate does not include taxes and fees.

How do you check a relay?

Listen for a click when the relay is energized. Check the energized condition of the relay contacts. Use a digital multimeter (DMM) to test the resistance between each pole of the relay and the corresponding NC and NO contacts for that pole. All NC contacts should read infinite resistance to the corresponding pole.

How do you troubleshoot a blower motor resistor?

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

Can you bypass a resistor?

A wire in the left circuit is shorting the 100Ω resistor. All current will bypass the resistor and travel through the short. The voltage across the 100Ω resistor is going to be zero. So typically the assumption of a short is done by redrawing the circuit.

Is a switch a resistor?

A resistor allows current to flow through it, but “slows it down” in a way. In short, a switch creates an open circuit and a resistor reduces the current in a closed circuit.

Why does my heater only work on high?

If your heater only blows when the setting is on high, this may suggest that you have a faulty blower motor resistor. The highest speed setting may still work because in most cars in the highest fan speed settings the current bypasses the blower motor resistor.

Why is my car heater not getting hot enough?

Ken Mattson, owner of Len's Automotive in Bellevue, Wash., says a car heater can stop working for a number of reasons, including: A low antifreeze/water level in the radiator due to a leak in the cooling system. A bad thermostat that isn't allowing the engine to properly warm up.

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.