16.03.2021

Category: Blower motor switch

Blower motor switch

This page is for personal, non-commercial use. The blower motor resistor is an electrical component that is a part of the vehicle's heating and air conditioning system. When fan speed is changed via the knob on the instrument cluster, the blower motor resistor changes setting, which changes the speed of the blower motor. As the fan speed is one of the most frequently adjusted settings of the air conditioning system, the blower motor resistor is put under constant stress, which can cause it to eventually fail.

A failed blower motor resistor can cause issues with the operation of the entire heating and air conditioning system. Usually a bad or failing blower motor resistor will produce a few symptoms that can alert the driver of a potential issue. 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. The heating and air conditioning systems may still function at one speed, however the resistor will have to be replaced in order for full functionality to be restored.

Another common symptom of a faulty blower motor resistor is a a blower motor that does not function on certain settings. This can also be caused by a blower motor switch, so a proper diagnosis is highly recommended if you are uncertain of what the issue may be.

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.

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A blower motor without power will not be able to produce any air pressure, and as a result the heating and air conditioning system will be left with no air coming from the vents.

As the blower motor resistor is the component directly responsible for powering the blower motor, when it fails it major issues with the blower motor and the heating and air conditioning system can be experienced. If your vehicle is displaying any of the symptoms above, or you suspect that your blower motor resistor may be having an issue, have the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if the component should be replaced.

This article originally appeared on YourMechanic. Autoblog is partnering with YourMechanic to bring many of the repair and maintenance services you need right to you. Get service at your home or office 7 days a week with fair and transparent pricing. We get it. Ads can be annoying. But ads are also how we keep the garage doors open and the lights on here at Autoblog - and keep our stories free for you and for everyone. And free is good, right?

If you'd be so kind as to whitelist our site, we promise to keep bringing you great content. Thanks for that.Older style blower motor resistor with exposed resistor elements. The resistor block contains three different high resistance coils.

Think of these coils like a filament in a light bulb. The coil resistance causes them to heat up, thereby reducing the amount of voltage that can flow to the blower motor. When a resistor coil burns out, you lose that fan speed.

How to: 2004 Jeep Wrangler TJ Fan Speed Control Resistor

A blower motor resistor can fail in several ways; since many are designed in series, if one resistor fails, you loose speeds In other designs, the failure of 1 resistor means you lose only one speed. However, most car makers bypass the blower motor resistor completely when you move the fan speed switch to high.

If your blower only operates on its highest speed, chances are you have the series type of blower motor resistor. This is the most common failure mode. To repair the problem, simply replace the resistor block.

blower motor switch

Unplug the electrical connector, remove the screws and replace the unit. Replacement blower motor resistor blocks are usually available from any auto parts store or the dealer. Those require a new solid state controller. You guessed it, they cost a lot of money. If your vehicle has a cabin air filter, check that before putting everything back together.

A clogged cabin air filter reduces airflow through the ducts, increases current draw on the blower motor and can cause blower motor resistor overheating and premature failure. If you replace the resistor and it burns out again, check the current draw on the blower motor. Even a few extra amps is enough to melt the plastic connector at the resistor.

So check for signs of scorching and melted plastic. If you find that, buy a new connector pigtail from the dealer and splice it into the harness. Replace the blower motor and the resistor and you should be back in business.

Unlike the cheaper Haynes and Chilton manuals that cover multiple year models, leaving the exact information you need to fix your car, these professional manuals cover your exact year, make, model. Plus, they contain full trouble code descriptions and troubleshooting instructions.

Pricing: Eautorepair. So you have to refer to the factory legends to learn the identification symbols and then refer back to circuit diagrams to find the splice and ground locations. However, Alldatadiy. If you need to dig into your doors, dash or console, Alldatadiy.

Find this article useful? Share it! Tags Blower motor resistor blower only works on high. Prominent words air filter blower motor resistor blower works blower works on high speed cabin air cabin air filter cause blower cause blower motor cause blower motor resistor clogged cabin clogged cabin air clogged cabin air filter current draw on the blower draw on the blower draw on the blower motor fan speed motor resistor replace the resistor resistor block works on high speed.Display Options.

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Symptoms of a Bad or Failing Blower Motor Relay

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blower motor switch

I am in the United States. International Customer Options. Delivery Options If you are an international customer who ships to a US address choose "United States delivery" and we will estimate your ship dates accordingly. International delivery. United States delivery. Recent Vehicles.In a nutshell, the blower switch interrupts and diverts the electrical current from one contact to another.

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What this means in plain English is that as you turn the blower fan speed knob from OFF to any of the fan speeds LO, M1, M2, and HIthe blower switch mechanically opens and closes the two contacts necessary to divert the incoming battery power from circuit G to the different circuits that'll get the blower fan speed you're choosing. To really explain this and make it make more sense, let me give you an example of what happens when you turn the blower fan speed knob from OFF to LO:.

Since these are mechanical connections the blower switch is making to open and close these circuits When this happens, one or several of the blower fan speeds stop working. The following circuit descriptions will help:. This is no cause for concern since the circuit descriptions are the same for all of the GM vehicles covered by this repair tutorial. The other, explained in TEST 2, is to bypass the blower switch and indirectly test the blower switch. All the illustrations in the image viewer are of the blower switch itself and NOT of the connector see image 6 of 6.

Don't have a multimeter or need to upgrade yours? Check out my recommendation: Abe's Multimeter Recommendation found at: easyautodiagnostics. With the blower switch knob set to the OFF position. You should have continuity between D and G see image 1 of 6 to identify the proper male spade terminals to probe. With the blower switch knob set to the LO position.

You should have continuity between C and G see image 2 of 6 to identify the proper male spade terminals to probe. With the blower switch knob set to the M1 position.

You should have continuity between B and G see image 3 of 6 to identify the proper male spade terminals to probe. With the blower switch knob set to the M2 position. You should have continuity between A and G see image 4 of 6 to identify the proper male spade terminals to probe. With the blower switch knob set to the HI position. You should have continuity between H and G see image 5 of 6 to identify the proper male spade terminals to probe.

Repeat the tests just to make sure of your test results.

blower motor switch

If continuity is not present where indicated in the test steps above and this lack of continuity coincides with the blower fan speed that's not working on your pickup or SUV, then you've found the cause of the problem. CASE 2: All circuits tested had continuity where indicated in the test steps. Your next step is to bypass the blower resistor using a simple jumper wire. Then we met. Page 1 Page 2. In this tutorial, I'll show you how to get it done in a step-by-step way.

Contents of this tutorial:. All Articles: 4. Applies To:. Do NOT follow this link or you will be banned from the site!You'll be able to test the blower motor switch, with the help of this tutorial, and find out if it's bad or not. Everything is explained in plain English and are simple tests a DIY'er can do with a multimeter and a jumper wire.

This tutorial applies to the S10, since they use the same type of blower motor switch. Late S10 use a different blower motor switch. Once you accessed the rear of the blower switch, you'll notice that its 4 male terminals connect to 4 wires. It's important to note that what we're looking for, on the digital multimeter reading, is a non-OL reading. In other words, the actual Ohms value is not important as long as the reading is not OL when the test step indicates a continuity result.

Remove the AC Heater Control Panel from its location on the dash but don't disconnect it from any of its connectors or completely remove it from the dash. Disconnect the blower motor switch from its connector. Place your multimeter in Ohms mode. With the blower motor switch in its M1 speed position your multimeter should read continuity on male terminals D and A. Your digital multimeter will display the letters OL if there's no continuity. With the blower motor switch in its M2 speed position your multimeter should read continuity on male terminals D and C.

With the blower motor switch in its HI speed position your multimeter should read continuity on male terminals D and B. CASE 1: Continuity exists in the indicated terminals at the indicated blower motor speeds. This is the correct and expected test result. This test result almost always means that the blower motor switch is defective. To be sure, I suggest doing one more test and it's to bypass the switch itself. This material may not be reproduced without the author's consent.

Page 1 Page 2. Contents of this tutorial at a glance:. All Tutorials: 2. Do NOT follow this link or you will be banned from the site! Hate Spam.Skip to main content Blower Motor Switch. Motorcraft YH Control. In Stock. I have a F Lariat with dual-zone climate control and the fan speed settings stopped working. The blower would only run at one speed. I was hesitant to purchase this item as tracking down Ford part numbers can be daunting sometimes. I'm please to report that this part worked like a charm and is very easy to change.

Same part numbers as on the original, although the plastic color has changed. I would recommend this fix as a DIY. All you need is an 8mm socket or a crescent wrench. Add to cart. The switch assembly was easy to install and worked perfectly. I had to watch a video to see how to get the dash apart but the installation process was very easy. I would highly recommend these switches and will order them again if one of my friends needs one.

The price is very good and a lot cheaper than the parts houses. Motorcraft YH Blower Switch. Installed in 04 f Works great, fixed blower problems. Appears to be genuine Motorcraft switch. Worked great for my father in-law's F van.

Blower motor switch

Only 11 left in stock - order soon. Perfect fit, however not perfect function as the 3rd speed does not work. Currently unavailable. Haven't been able to use my blower on more than the high setting. This fixed that immediately and was a super easy fix. See All Buying Options.

Only 18 left in stock more on the way. Fits and works in my 92 XJ, all you can ask for from a switch.Our mobile mechanics offer services 7 days a week. Upfront and transparent pricing. Our certified mobile mechanics can come to your home or office 7 days a week between 7 AM and 9 PM. It depends on the type of car you drive and the auto repair shop you go to.

Our mechanics are mobile, which means they don't have the overhead that repair shops have. They provide you convenience by coming to your home or office. The air conditioner and its varied parts cools the air during the summer. The blower motor is what pushes the conditioned heated or cooled air out of the dash and into the cabin of the vehicle.

Depending on the make and model of your vehicle, you may have one, two or even three blower motors, each with their own blower motor switch. Essentially, the blower motor switch allows you to control the airflow within your vehicle.

It lets you set the fan to off, low, medium or high or a number of other speeds depending on the system in question. Over time and through normal wear and tear, the contacts inside the switch will wear out and it will fail, requiring a new blower motor switch.

That could mean anything from being uncomfortable, to being dangerously overheated or chilled depending on the weather conditions. If you suspect your blower motor switch is not working properly, have its operation checked by one of our expert mechanics.

Although a failed blower motor switch will not prevent you from driving, it is important to be comfortable in your car and have clear, unfogged windows. Have the problem inspected and repaired as soon as possible. With YourMechanic you can skip the auto shop altogether. They send certified and screened mechanics straight to your door and enable you to save big on car repair and maintenance.

Blower Motor Switch Replacement at your home or office. Get an upfront price. Service Area. YourMechanic Benefits Online Booking. Mechanic comes to you.

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Free 50 point safety inspection. See availability. How much does Blower Motor Switch Replacement cost?

Symptoms of a Bad or Failing Blower Motor Switch

Most switches exhibit erratic behavior before failing completely, so you should have some indication about impending failure. How it's done: The blower motor switch is verified that it needs to be replaced. The blower switch trim panel is removed for access. The defective blower motor switch is disconnected and removed from the trim panel. The new blower motor switch is installed into the panel and the panel is reinstalled. The blower motor switch is tested for operation on all blower speeds.

What common symptoms indicate you may need to replace the Blower Motor Switch?

blower motor switch

Erratic operation fan operates in some switch positions but not others, for instance Blower motor will not operate at all. How important is this service? How can we help?


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