When do you need to replace the blower motor relay?

If the blower motor does not function, car fuses are blown, or relays are melting, you may have to replace the car blower motor relay. 1. Blower motor does not function 2. Blown fuses 3. Melted relay The blower motor relay is the electrical switch that is used to supply the power for the vehicle’s blower motor.

What causes a fuse to blow on a blower motor?

If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. Any sort of electrical spikes or excessive current from a bad relay will blow the fuse and cut power in order to protect the system.

Where is the blower control switch on the dashboard?

The blower control switch on the dashboard controls the circuit flow of the blower motor to adjust the voltage from low, to medium, to medium-high, to high. When on high, the circuit bypasses the blower resistor.

Where is the blower relay on a fuse block?

Pull the blower relay out of the fuse block. The blower relay is located near the front of the fuse block and is labeled “Blower.” Inspect the center of the relay. If the metal rod inside is broken, the relay will need to be replaced.

Where is the under hood motor relay located?

The blower motor relay is located in the under hood power distribution center and is simply labeled “Blower.” It will only take a few minutes to inspect and replace the relay if necessary.

How do you replace a blower motor resistor?

Reinstall the two screws holding it in place (start with the wrench and tighten with the ratchet) and plug the electrical connector back in. If you want, you can reinstall the useless metal bracket. I left it out. I think it’s suppose to hold a relay and the resistor in place, but I didn’t see a need for it.

What should I do if my blower motor is not working?

The blower motor is crucial to the proper functioning of your HVAC system. This video will show you how to properly diagnose your blower by using the multimeter to perform an AMP draw as well as replacing the blower motor relay. Loading…

Why does my blower motor keep blowing fuses?

Relays are a vital protection against electrical surges. When the relay receives a jolt of strong current or simply cannot manage and distribute its load, it will send excess current into the fuse. This forces a shutdown which protects the entire system from electrical damage. Thus, blown fuses could be a sign of relay issues.

What happens when a blower motor relay wears out?

Without it, the AC system will not be able to circulate any heated or cooled air. The blower motor relay controls the current used to power the blower motor, and is subject to the constant on and off switching. Over time, it can eventually wear out.

What happens if you have a bad blower motor?

The blower motor is the component responsible for pushing air through the vents of your vehicle’s heating and air conditioning systems. Without it, the AC system will not be able to circulate any heated or cooled air.

What should the CFM of a blower be?

The goal is to increase the cfm from 3000 cfm to 4000 cfm. Changing a pulley size or making an adjustment on the motor pulley if it is adjustable will accomplish this. The most economical and practical pulley to replace is the motor pulley.

What are the parts of a blower motor?

HVAC Blower Motors Category Description Alliance™ Part # MOTOR MOTOR 12 V DBL S ABP N83 301042 MOTOR BLOWER MOTOR ASSY 12V ABP N83 301250 MOTOR 24V MOTOR BLOWR ASSY ABP N83 301567 MOTOR MOTOR BLOWER ASSY 24V ABP N83 301266

What to do if your heater fan relay is not working?

Put everything back together the way it came and re-program the code into the radio if needed. If you’ve checked the fuse panel, and the fan motor doesn’t run at all, or if it runs only on the lower speeds, the blower motor relay may be at fault. Relays are used to carry electrical loads that are too large for conventional switches.

How to replace a heater motor switch or relay?

Step 1: Replace the switch. At this point you should have the switch in a position to easily disconnect it. Be careful, there are usually locking tabs on the connector that have to be squeezed before it will release and pull off. The plastic connectors are brittle and break easily.

When to replace a heater blower motor switch or relay?

When the motor gets old and tired it will draw more current through the wires than a new motor. It may still draw enough current to blow the fuse after it runs for a while. In that case, a motor replacement is in order. Step 1: Disconnect the battery. Put on your safety glasses and disconnect the battery at the negative cable.

What is the function of the blower motor relay?

The blower motor relay is the electrical switch that is used to supply the power for the vehicle’s blower motor. The blower motor is the component responsible for pushing air through the vents of your vehicle’s heating and air conditioning systems.

Why does my blower resistor keep going bad?

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 the 10 Amp Fuse on my heater fan burned out?

The 10 amp fuse was not burned out. The blower motor resistor was a little rusty.I inspected and found no burned or melted wires anywhere , at the inside three way dash switch , at the blower motor and at the resistor.I know the air bag is tied into the same fuse , I must have replaced the fuse 12 times .

How to replace a blower motor resistor thermal fuse?

Blower Motor Resistor Thermal Fuse Replacement 1 Order the Correct Fuse. The part I ordered is from NTE Electronics. 2 Remove Old Fuse. Now the instructions say to use the crimps and only make mechanical connections. 3 Continue Removal. 4 Tin. 5 Solder the Crimps. 6 Add the Fuse. 7 Rinse and Repeat. 8 Another Shot

Where is the fuse on a Toyota heater?

the heater fuse/relay is behind the kick panel on the p/s of the car (kick panel is the panel under the dash and between the door and firewall) also while you are down in that area check to make sure the blower motor is getting voltage aka bad blower motor) I think it’s actually a 30A circuit breaker instead of a fuse.

What should I do if my heater fan doesn’t work?

Replaced 10 amp fuse , blower relay,blower motor,dash s dash switch and switch out under the hood relays. Seems no power to anything when checked with a test light. Blower motor *resistor* been tested? ..

What are the symptoms of a failed blower motor resistor?

Blower motor resistor problems. Problems with a blower motor resistor are common in many cars. The most common symptom of a failed blower motor resistor is when the heater fan only runs at high speed and doesn’t work at low speeds.

How to check if the blower motor belt is the issue?

To check if the blower motor belt is the issue, first ensure that the furnace door is fully closed properly, as the furnace will not work if the door is open due to a switch on the inside of the furnace door. Locate and turn off the main circuit breaker or safety switch for the furnace, to ensure there is no power going to it.

Where does the power transistor go in a blower motor?

The power transistor has 4 wires: two come from the climate control system control unit, one is the ground, one goes to the negative terminal of the blower motor. The service manual advises measuring the voltage at the blower motor, then if not OK, at the power transistor and so on.

Where does the power go in a blower motor?

For each higher speed, power flows through one less resistor. Some car makers run blower motor power through the fan speed switch first, then through the blower motor resistor and then to the blower motor and ground. Other car makers reverse that and run power to the blower motor first and terminate ground at the blower fan speed switch.

If it’s good, refer to a wiring diagram for your vehicle and conduct these tests: Disconnect the electrical connector at the blower motor and jumper power and ground to the motor, bypassing all the speeds controls.

What kind of motor does a variable speed blower use?

Variable speed blower motors don’t use a blower motor resistor. Instead they use a blower motor speed control or a power transistor. Variable speed motors are most often used in vehicles with automatic climate control.

Where do I find the blower motor fuse?

While replacement is easy, the exact location of your blower motor fuse may vary from vehicle to vehicle. Locate your vehicle’s blower motor relay. In the vast majority of vehicles, you can access the relay through the glove compartment. Open the glove box and empty its contents.

When do you Know Your heater motor switch is broken?

While there are differences from car to car, there are a few common elements to the job. Some common signs of a broken blower motor switch are if the switch only works on certain air settings, which occurs when a contact wears out, or if the switch is stuck or often gets stuck, indicating that the switch is not working properly.

Why is the resistor not working on my blower?

Hi There, The resistor is what controls the speed of the blower motor, not the relay. The blower motor relay supplies power to this motor when you turn the switch to “on” that can sometimes fail. When this happens, you may notice that you will not feel anything blowing out of the vents at all.

Why is the blower motor not working on my car?

My car has an automatic transmission. Hi There, The resistor is what controls the speed of the blower motor, not the relay. The blower motor relay supplies power to this motor when you turn the switch to “on” that can sometimes fail. When this happens, you may notice that you will not feel anything blowing out of the vents at all.

How is a blower fan connected to a battery?

A blower fan is connected to the negative battery terminal (also called ground) on one end and to the positive battery terminal through a blower motor resistor on the other end. The blower resistor is connected in series to the blower fan motor.

What causes a bad or failing blower motor relay?

Blown fuses. One of the first symptoms of a bad or failing AC blower motor relay is a blown AC blower motor relay circuit fuse. If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. Any sort of electrical spikes or excessive current…

Why is my F-150 blower motor resistor not working?

2010 F-150 blower motor resistor – YouTube I noticed that the speed selection on the fan in the 2010 F-150 was progressively not working. First selection 1 didn’t work than 2 than 3.

What are the relays on a Ford F150?

TRAILER TOW (BATTERY CHARGE) RELAY Battery junction box (BJB). TRAILER TOW (LEFT TURN) RELAY Battery junction box (BJB). TRAILER TOW (PARKING LAMP) RELAY Battery junction box (BJB). TRAILER TOW (RIGHT TURN) RELAY Battery junction box (BJB). UPFITTER RELAYS 1, 2, 3 & 4 Battery junction box (BJB).

What are the fuse boxes on a 2010 Ford F-150?

The 2010 Ford F-150 has 2 different fuse boxes: Power mirror switch, Memory seat module microprocessor power, Steering column switch Instrument panel cluster, Key out inhibit solenoid, Radio info display (CID), Radio buttons, Key-in chime Auto dimming rear view mirror, Door lock switch illumination, Radio accessory delay

How many cooling fan relays are there in a Ford F150?

There’s lots more information on this site for your vehicle. 77 10 Cooling fan relays, A/C clutch relay. Positive Crankshaft Ventilation (PCV) heated fitting, Floor shifter, Overdrive cancel switch

When does the radiator fan kick on in a 2010 Ford F150?

2010 Ford F150, Radiator fan seems to be running on high more than it should. Fan kicks on about 30 seconds after vehicle is started and is extremely loud. Even kicks on when its a cooler day. Also stays on when driving down the highway.

Where are the fuse boxes on a 2010 Ford F150?

This 2010 Ford F150 Fuse Box Layout post shows two fuse boxes; the Battery Junction Box/Power Distribution Box located under the hood and the Smart Junction Box/Passenger Compartment Fuse Panel There’s lots more information on this site for your vehicle.

What does it mean when your blower doesn’t blow?

If the voltage is there ok at the connector (with the motor plugged in), and the blower doesn’t blow, that means the blower motor is faulty. When you do this you may find the reason the motor failed, a bunch of leaves and twigs has got sucked in and stuck in the blower fan cage.

Where is the fuse panel on a Ford F-250?

The fuse panel is located below and to the left of the steering wheel by the brake pedal. If equipped with Remote Keyless Entry-Driver Door Unlock Relay Coil, All Door Unlock Relay Coil, All Door Lock Relay Coil, Park Lamp Flash Relay, If not equipped with Remote Keyless Entry-Power Door Lock Motors

Where is the blower motor fuse and relay located?

The blower relay is located near the front of the fuse block and is labeled “Blower.”. Inspect the center of the relay. If the metal rod inside is broken, the relay will need to be replaced.

Where is blow motor relay located?

The blower motor relay is generally located in the under-hood fuse box or in the under-dash fuse box. A blown fuse can mimic relay failure. A failed blower motor switch can also give many of the same symptoms.

Where is the blower motor in a car located?

Some blower motors are easy to access, and others are buried under the dash. Most passenger cars and trucks have heater boxes and blower motors that are located inside the passenger compartment , but there are some instances where the heater box, blower motor, or both, are located in, and accessed from, the engine compartment.

Where is the front blower relay located?

The front blower blower motor relay is o nthe left side of the dash at the base of the A pillar. Download showing wire diagram Download showing location, see C-1 area.

What are the signs of a broken blower motor switch?

Some common signs of a broken blower motor switch are if the switch only works on certain air settings, which occurs when a contact wears out, or if the switch is stuck or often gets stuck, indicating that the switch is not working properly.

Where are the fuses on a Ford Explorer?

Fuse box diagram (fuse layout), location and assignment of fuses Ford Explorer UN105/UN150 (1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003). Fuses and circuit breakers protect your vehicle’s electrical system from overloading.

What are the contacts on a Ford relay?

Photo 3 of 3 (in the image viewer) shows the armature (middle arrow) and two contacts. A spring. Photo 2 of 3 (in the image viewer) shows the spring (bottom arrow). Several contacts. When the electromagnet gets energized (by having current flow thru’ it), it moves the armature to close against another set of contacts.

What is the movable armature on a Ford relay?

Photo 2 of 3 (in the image viewer) shows the electromagnet (top arrow points to it). A movable armature. This is the part that completes the high current circuit by uniting the circuit that has voltage to the circuit that will deliver it to the component (fuel pump, cooling fan relay, etc.) that needs the voltage/current.

Where can I find a Ford relay bench test?

Relay Basics. Relay Bench Test. You can find this tutorial in Spanish here: Cómo Probar En Banco Un Relé De Ford (Relé Grande) (at: autotecnico-online.com ). For your cross reference information: This relay is used for the PCM, fuel pump, fan motors, and a bunch of other stuff.

What to do if your blower switch goes bad?

I went through and replaced all the major culprits.. a new blower motor, new blower resistor & harness, and new blower relay. Wouldn’t you know, still nothing. What possibilities are left? I was wondering if the switch itself (in the dash) can go bad.. I don’t get this. Great timing in the summer heat!

What happens when you change the fuse on a blower?

If the blower works when you change the fuse, you may not be out of the woods yet. When the motor gets old and tired it will draw more current through the wires than a new motor.

What to do if your blower fan stops working?

If you have checked the resistor,the relay fuse, the regular fuses, the switches, and the blower fan motor and none of that works try replacing your thermostat. It’s not an expensive or tedious task but that is what worked for me.

What to do if your electric leaf blower is not working?

Electric leaf blowers are a straightforward piece of equipment that many gardeners use. If one is not working properly, the problem will be small and probably not difficult to locate. Here’s a routine to check your leaf blower from plug to mouth.

What happens when the blower motor switch stops working?

When this happens, one or several of the blower fan speeds stop working. The cool thing is that diagnosing/troubleshooting the blower switch isn’t hard. The following circuit descriptions will help:

What to do if your blower fan is not working?

Blower Motor Resistor Replacement – YouTube Blower fan not working – 2004-2014 Ford F-150 and other models. Blower Motor Resistor Replacement If playback doesn’t begin shortly, try restarting your device.

Where is the AC blower relay located?

The blower motor relay is located in a wire harness connector that is secured to the Heater-A/C housing behind the glove box on the passenger side of the vehicle, next to the Heater-A/C wire harness connector in the passenger compartment.

Where is blower speed control module located?

The blower motor electronic automatic temperature control module is located behind the center of the dash panel . The blower motor speed controller is in the right rear of the engine compartment on evaporator and in some cars acts as the resistor.

Why does my GM blower motor resistor keep failing?

In some cases, the heat is so high that it melts the connector. This is common on late model GM vehicles. If you discover a melted connector, do NOT attempt repair. Purchase an upgraded pigtail and splice it into the harness along with a new blower motor resistor.

When do you need to replace the blower motor relay?