What causes a blower fan to not work?

When this happens, you may notice that you will not feel anything blowing out of the vents at all. This may also cause the blower motor to work intermittently. 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.

Is there a problem with the GM blower motor?

If you have a General Motors car or truck from 2002 through 2008 you’ll probably have a blower motor issue at some point. In many cases it’s a problem with the GM blower motor module. The most common complaint when this part fails is the motor will not turn on at all.

Where does the air come from in a GM blower?

As an example, if you select defrost, the mode door points all the air at the windshield. If you select heat, then the air will be directed at the floorboards. In the AC mode all of the air should come out of the air conditioning vents. If you select blend, then you’ll get air coming out of all of the positions.

How can I tell if my blower motor is working?

If the blower motor works it’s time to check some voltages at the module. There’s a power wire that comes from the control panel. On most models it’s either red or purple. This power in wire should turn on a test light with the ignition on and maximum speed selected. The black wire should indicate a strong ground.

Why is my blower motor not coming on?

With the back wire hooked up I ran a jumper directly to the battery pos and attached it the purple wire terminal on the motor. The motor did not come on. So either my motor is dead shorted or something has gummed up the brushes or they are worn out.

Is the air handler or blower assembly turned on?

Here we provide air handler unit or blower assembly troubleshooting by expanded annotated information from the US EPA [5] who provided suggestions for investigating the air handling unit during an indoor air quality investigation. Is the system turned on?

Why does my HVAC blower need to be replaced?

The blower motor is the part of your HVAC system that uses the most energy, so it may very well be the culprit if you see a significant rise in your utility bills. An aging, problematic, or dirty motor has to work harder to properly circulate conditioned air throughout your home, which leads to higher energy consumption.

How to troubleshoot and repair vents low air flow?

Easy step by step guide one how to troubleshoot and repair vent low air flow, this article pertains to most vehicles. Step 1 – Most air control vents are equipped with a flow control door that is located at the vent outlet. This door is controlled by a thumb wheel that when activated will open and close the vent air flow door.

What to do when your AC Fan is not working?

Checked for incoming resistance ground to the blower, from the dash control switch and it works. Checked for battery at the blower, when the car is running. There is no battery to operate the blower. Rotated all the PDC relays around, they have the same ID, other than ABS pump.

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.

What happens when a car fan is not working?

That means a trickle out of your vents instead of the rush you asked for. When it does happen, you’re left with a miserably underpowered heat or AC system. It will still work with no fan, and you’ll usually still be able to control the temperature of the air that is blowing or trickling, out.

Why is my AC heater fan not working?

This sounds more like a problem with high speed fan relay. On the low speeds, the fan relay routes the voltage thru the resistor block. When you switch to high fan speed, the relay switches over to supply full voltage from the battery to the fan motor.

Why does my heater not work on high speed?

Heater blower motor will not work on high speed? I have replaced the black bosch relay behind the glovebox, the blower resistor and the blower motor and still cannot get the blower to work on high. I remember in older model years of gmc’s and chevys that their was a high speed blower relay that caused this issue.

How do you turn on a high speed heater fan?

Now pull the zip tie tight and cut the long end off with side cutters. Now reconnect your battery and turn your ignition switch back on and fan speed switch on high. The fan should be blowing on high, now wiggle the connector one more time the fan should stay on without interruption.

Why does my GMC heater blower not work?

I have replaced the black bosch relay behind the glovebox, the blower resistor and the blower motor and still cannot get the blower to work on high. I remember in older model years of gmc’s and chevys that their was a high speed blower relay that caused this issue. If there is a high speed relay, I can’t find it. Any suggestions?

What to do if your heater motor stops working?

They wanted over 500, including diagnose, and the ign. cable, which it didn’t need. I had my blower motor go out then I replaced the fan motor and it is working but got a immediate. Dash light for engine could the ignition switch be bad too.

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

AC/Heater Blower Fan not Working – Motor or Resistor? Quick Fix If playback doesn’t begin shortly, try restarting your device. Videos you watch may be added to the TV’s watch history and influence TV recommendations. To avoid this, cancel and sign in to YouTube on your computer.

Why does my Dodge Ram heater stop working?

Its stupid cold outside so did not check power at the motor, so don’t know it has power or not. I could be the motor is bad. I also had one truck where the ignition switch had melted some causing the blower not to work. Ok had the motor out & bearings are bad not it still works on bench, it just stops fast after power is off.

What are the signs of a bad heater motor?

Common signs include the car’s heater not working or getting stuck on a certain speed, or something getting jammed in the blower motor. 1. Blower motor stuck on one speed 2. Blower motor does not work on certain settings 3. No air from the vehicle’s vents Average rating from 130,908 customers who received a Vehicle Engine Cooling Inspection.

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.

Why is my blower not working in Hi ( 5 )?

The usual failure of the resistor pack is if it works in HI (5) but not in any other mode or just a few modes. When you switch to high,the blower motor relay coil circuit is grounded and voltage is now applied directly through the relay to the blower motor; bypassing the resistors. So, I would look to see if the relay is ok.

How does a high speed blower motor work?

In the highest fan speed state, the blower resistor is bypassed completely and the fan is effectively connected directly to the car’s battery, allowing maximum current to be supplied to the blower motor.

What happens when the blower motor switch goes bad?

Since the blower motor switch is the direct control for the blower motor speed, when it malfunctions or has any problems it can affect the functionality of the entire AC system and should be serviced.

What to do if your fan switch stops working?

The circuit breaker can be reset using a narrow screwdriver or pin. You may need to remove it to do this. If that doesn’t solve it. check the circuit breaker for continuity after resetting it to see if it’s defective. If this fails, check if the AC compressor comes on when you have the AC button on and the fan switch on.

How can I tell if my blower fan is a relay?

The only way to test and see if it is a blower motor relay would be to test with a voltmeter to see if the motor is getting 110 volts to the motor when it starts going off and on. I hope you can easily find and fix the problem.

Why is my blower motor stuck on one speed?

Blower motor stuck on one speed 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.

What happens if you have a bad blower motor resistor?

If you have faulty blower motor resistor you may experience low airflow coming from the vents even when the fan is all the way on high. In some cases bad blower motor resistor may not even turn the blower motor fan as a result your fan will not work at all and there will be no air coming from the vents.

How is the speed of the blower motor controlled?

The blower resistor is connected in series to the blower fan motor. This means that the current running through the blower motor, and its’ speed is therefore controlled by the resistor value. The user chooses a fan speed by selecting a speed which then connects one of the resistors in the blower resistor pack.

How does a blower motor resistor control the fan speed?

The blower motor resistor controls the fan speed of the blower motor and the resulting change in air pressure produced by the movement of the blower fan. It accomplishes this by regulating the electric current that powers the motor.

Why do I need a variable speed blower motor?

A variable-speed motor, on the other hand, can operate at lower or higher speeds, which results in a more even temperature throughout your home and better energy efficiency. Similar to other components in an HVAC system, the blower motor will become more vulnerable to mechanical failures as it experiences more wear and tear over time.

What is the name of the fan on a leaf blower?

Your leaf blower manual may refer to a fan, which is simply another name for the impeller. As above, the fan is attached to the crankshaft, and when it rotates it provides air flow. You leaf blower’s fan will have several fins that move the air while the fan is operating.

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.

Why does my blower not work at high speeds?

Blower works on slow speeds, but not on high speed. Check for bad fuse or bad high speed relay. Swap the high speed relay with another relay with the same part number. Also, check the fuse for the control side of the high speed relay. Make sure the ground side of the high speed relay is working. Blower works on some speeds but not others

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…

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.

Is there an issue with the Infiniti G37 engine?

Regarding the engine system in the Infiniti G37 for the 2008 model, the main issue deals with unintended acceleration while your car is rough idling, with the main issue occurring at around 94,000 miles and has users stating that the car would rev and cause united acceleration occurring while in traffic.

What should I do if my car fan is not working?

Blower still does not work. Checked continuity of 40 amp blower fuse; it’s okay. Checked most fuses for continuity in the PDC and Junction Box and they are okay. Note, there is no burnt or corroded wiring.

What to do if your AC blower is not working?

Disconnect cables to motor and resistor. Remove hose from motor, it should just pull off with little effort. Unscrew motor and resistor. Screw new motor and resistor in. Connect hose to motor. Connect cables to motor and resistor. Turn on car and test AC. Thanks for watching! Loading…

Why does my Dodge Caravan have no heat?

My problem is on a 1996 Dodge Caravan 3.3 liter. It has A/C but is a short body and has no rear heat or A/C. The trouble relates to the blower motor and its activation. My blower motor does come on. The Haynes manual says the blower is activated by a relay. I need to find the location of this front blower relay and the fuse that powers it.

Where is the blower fuse on a Dodge?

Dodge owners manual shows the 40 amp blower fuse, #25, but does not mention any blower relay in the PDC. All the relays in the PDC have designated legends on the cover, but none indicate they are for the front blower relay. Haynes also states this blower relay is powered via a fuse in the junction box from under the dash, #12, 10 amp.

Where is the fan resistor on a Navara?

The resistor is typically located near the blower motor under the passenger side of the dash. and will have 4-5 wires going to it. I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

When to replace AC fan speed resistor 98-04?

Buy Now! When your blower motor for the AC and heat isnt working on all settings then chances are your blower motor resistor has failed. This is usually do to moisture from the cabin air box corroding the electrical component. Here we’ll show you how to repair it and if you’re in need of a new one, check out 1AAuto.com.

Can a blower fan only work on high speed?

Blower Motor Fan Only Works On High Speed? Plus – Tips To Prevent Repeat Failures! If playback doesn’t begin shortly, try restarting your device. Diagnostic training videos and content hosted by ASE Master and L1 Certified Technicians.

Why does my AC fan only work on high?

If your speed selector for your AC or Heat only works on high, or low, or if its missing any particular speed, this video will show you how to fix it once and for all. This is a fix for 2nd generation Dodge Rams (1994-2001-2002 2500/3500) Loading…

What to do if your blower fan stops working?

Take glove box out on passenger side. Upper left corner is Blower Fan Knock on it. If it comes on it is going out will need to replace. Blower fan will not come on at all? Check Fuses & Blower Fan? Fuses replaced for blower fan,took blower fan out and tested it and it worked? Well it has to be you climate control panel nothing else to check!

What should I do if my fan wont turn on?

Connect and power up the fan motor. If the fuse is faulty, the motor will rotate, mine did. If it did not, it might also be that point “C” was used instead of “B”, since you could not know which terminal it was. No worry. 6. Disconnect power. Move point “C” to “B” and power up the fan again.

Can a bad capacitor cause a fan not to start?

You took over its job of kick-starting the fan by pushing the blades. If the fan doesn’t start running, you may have a bad fan motor. If you have difficulty getting the blades to turn, there may be debris wrapped around the fan axle, or the motor bearings may be dirty or jammed. Here’s a second way to check for a bad capacitor.

Why does my AC fan keep failing to start?

If you leave the unit running, the fan motor will keep attempting and failing to start. The capacitor may also be used to keep the fan motor running properly as well as starting it.

How to troubleshoot a fan in a car?

Step 2: Troubleshooting 1 Disconnect power. 2 De-solder (or cut) the wires at capacitor terminals and connect them to a new capacitor (same type). 3 Power up the fan. If the motor still refuses to rotate then I believe the problem is with the motor windings and it’s time to say bye-bye to the

What can cause a fan motor to break?

The top cause of fan motor ‘breakdowns’ is a bad run capacitor. Always visually check the capacitor before you start testing because ruptured capacitors and capacitors with dents or any other types of deformities are obviously broken and you need to replace them as soon as possible.

What to do if your fan won’t rotate?

1. Disconnect power. 2. De-solder (or cut) the wires at capacitor terminals and connect them to a new capacitor (same type). 3. Power up the fan. If the motor still refuses to rotate then I believe the problem is with the motor windings and it’s time to say bye-bye to the fan. Once the thermal fuse has been determined to be the cause, here we go…

Why is the fan on my Nissan Frontier not working?

Disconnected the motor and brought it into the garage. The fan has a big white fan blade on top and the motor sits in a black plastic case. One philips screw holds the motor in the casing. I carefully pried the motor out of the casing. My fan blade was a bugger to get off. Seized on.

How can I tell if my blower motor resistor is faulty?

Another symptom of a faulty blower motor resistor is no air from the vehicle’s vents at all. 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.

Why is my blower motor on my Ranger not working?

I recently experienced a problem where the blower motor in my 1996 Ranger quit working. When working with your blower motor you have to first understand that the blower basically works in the opposite manner of most automotive electrical components. Normally you switch on a positive current to an electrical component to turn it on.

1. Stuck blower fan. The motor is not spinning at all or not fast enough. 2. Defective motor. The motor is not working. Usually an open fuse inside the motor. 3. Loose or defective wiring. The wires that connect the motor to the circuit board are loose or damaged. Circuit board does not get signal from the functioning motor. www.rural-energy.com

What to do if your blower motor gets stuck?

Blower motor gets stuck in a lat spot and will not turn. Once it’s gets going again it will be fine and work great. Will either replace it or, in the interim, will have to grease the shaft of the motor.

What causes an ee8 error on a blower fan?

Several problems can cause the EE8 error. 1. Stuck blower fan. The motor is not spinning at all or not fast enough. 2. Defective motor. The motor is not working. Usually an open fuse inside the motor. 3. Loose or defective wiring. The wires that connect the motor to the circuit board are loose or damaged.

What happens when a blower motor resistor gets too hot?

If the fan malfunctions (like if the fan shaft is spinning in the blower cage hub without spinning the cage) so that no air is moving past the resistor but current is still creating heat in the resistor pack, the thermal fuse that is integral to the resistor assembly opens the electrical circuit to prevent the resistor (s) from getting too hot.

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

Check the fuse in the fuse box rated at 30 amps which is for the Blower. Also check the fuse on location 5 of the interior fuse box rated at 10 amps. If both fuses are good then check the blower motor relay which might need to be replaced. If the motor still does not work then in its high position check for power and ground.

Why does my car heater blower not work?

When this happens, you may notice that you will not feel anything blowing out of the vents at all. This may also cause the blow motor to work intermittently. I would suggest having an expert from YourMechanic come to your location to diagnose your vehicle’s blower motor system.

Why is my HVAC blower running very slowly?

Typically Red=Low, Blu=Med, Blk=High. The black lead is usually the one needed for a/c operation. Sometimes the motors wear out by having the lubricant in the bearings go dry. In this case the blower wheel will not turn effortlessly and smoothly by hand when the unit is off. If the bearings are dry, then you need a new blower motor.

What kind of blower does not work on high?

1997 GMC C1500 Heater/AC Blower Will Not Work on HIGH. 1997 GMC C1500 Heater/AC blower will not work on HIGH. I have replaced the black BOSCH relay behind the glovebox, the blower RESISTOR and the blower MOTOR and still cannot get the blower to work on HIGH.

Why does my blower run for a while then dies?

The fuel lines on your blower carry fuel from the tank to the engine. If these fuel lines are obstructed, it can’t allow the proper amount of fuel to enter the engine, which will cause it to run for a short time, but ultimately stall out. You may be able to clean out the fuel lines and solve this problem.

What causes a blower motor to stop working?

In a situation where the motor doesn’t work on any speed, the most likely causes are: a blown power supply fuse, a bad motor ground connection, bad motor speed control module or a failed motor. On all systems, a failed blower motor is least likely. Blower motors generally don’t fail out of the clear blue.

Why is my fireplace blower not working properly?

However, if the blower still doesn’t function properly, it is most likely an issue with the motor. Regularly clean the fan and the motor of your blower to help it work at its optimal level.

What’s the best way to clean a blower?

Slide the cover off the blower assembly and set it aside. Now you can inspect the fan blades for dust and dirt, as well as any materials wrapped around the fan shaft. Clean the fan blades with an old cloth. Use tweezers to pull any clogged material off the fan shaft. Pull the two wires off the motor terminals on the blower assembly.

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