How To Test Window Motor


When your car suddenly will not start, it is important to know what motor makes your vehicle work. A window motor is one of these components.

A window motor works by opening or closing the window (the glass part of the car door) in either vertical or horizontal direction. For example, when you open the driver side window down, the motor moves the left window sash up or up-down. Or if you roll down the passenger side window, then the motor moves the right window downward.

If you try to move the window and the motor does not respond, this can be cause for suspicion. You may need to pull out the switch that controls the motor, so it cannot operate and you do not have access to use the windows.

It is very important to understand how motors work in order to identify whether this is a short term issue or if there is more serious damage. If you are ever unsure about whether something is working or not, you can always test it!

Testing the Functionality of Your Car’s Electrical System

There are several ways to test the electrical system functionality of your car. Some of the most common tests include: turning the ignition on, checking all lights, testing doors and hood latches, looking at the display screen of your radio, and listening for noise coming from the engine.

All of these symptoms should function normally unless there is a problem with the electricity going into the car or the car itself.

Check the windows are not warped

how to test window motor

Even though it seems like your windows work fine, you should still check them to make sure they will close and open properly. If they do not, then there may be something wrong with how they move up or down.

One of the most common things that cause this is when someone presses their hand against the window while closing it. The weight of the person can cause the track to lose its tension and thus stop working effectively.

Another thing to look out for is if the plastic roll-up seals break down or wear away over time, which allows moisture in and around the glass panes. This could also prevent the windows from fully lifting.

If one of these happens, then you must either replace the part or fix the window so it works correctly.

Use a blower to test for leaks

how to test window motor

A very common way to check window motor functionality is using a hairdryer or other source of airflow. Simply blowing air across the windows will show whether the windows work by preventing the flow from escaping.

If you can easily blow open the windows, then your window motors are working properly! If they resist being opened, then there may be a problem. You can also close the windows to make sure they stay closed, this tests if their seal has broken down due to age or poor maintenance.

Using a hairdryer is not the best method to use when checking windows as some hair dryers have strong enough suctions that could pull up residue or water from outside the vehicle. This would cause an inaccurate result in the window testing!

Instead of using a hairdryer, we recommend using a hand-held fan which does not produce much wind pressure. Most fans have an intake hole and outlet hole so you need to put one piece of plastic paper over the holes to prevent any fluid from drying out the machine.

Press the fan slowly closer to the window while watching to see if it drops off or if a thin stream comes out.

Use a pressure gauge to test for leaks

how to test window motor

The next step in testing your window motor is using a pressure gauge to check to see if there are any leak points. You can use a digital or an analog pressure gauge to do this.

A pressure gage comes with a fluid reservoir that connects to two tubes, one connected to the air intake of the vehicle and one attached to the exhaust. As you turn the engine on, the fluid in the tube will expand due to the elevated temperature. This expansion creates some pressure which you can read on the gauge.

You can also connect the other end of the tube to another source of pressurized gas such as compressed air or nitrous oxide so that you can get a more accurate reading. By doing this, you can determine whether there are cracks in the tank or not, or if the hose has come loose.

Check the windows are not broken

how to test window motor

If you feel your car is running poorly, check that its windows work properly. You can test this by trying to roll down an up-locked window.

If it works then great! You do not need to worry about the motor working correctly as everything else does too.

However, if the window doesn’t move or there is a sound of grinding when it tries to go down or up then you should take your vehicle back to where you got it serviced and have them look at it.

It could be due to a bad window switch so try changing those first. Then either get new ones or see if you can fix yours, however we recommend going for a replacement.

Hopefully you didn’t spend a lot of money getting your windows fixed though and don’t pay too much attention to whether they worked, sometimes things just don’t want to play nice together.

Check the windows are not too hot or too cold

how to test window motor

While motors do require some energy to work, they do so very quickly! If your window motor is having trouble closing all the way down, it may be because it is getting hotter as it works harder. Or if it takes longer than expected to close, could be due to it being colder, thus taking longer to activate.

If you notice that this happens during winter weather when the temperatures drop, then make sure your vehicle can handle these temperature variations. If it can’t, you may want to look into alternative ways to close your windows (or use of manual levers).

But in warmer weather, your car should have no problem operating the engine and windows correctly. Make sure your vehicle is able to withstand heat before blaming any issues on poor performance of the windows.

Check the windows are not vibrating

how to test window motor

While windows can be manually operated using either hand strength, some have motors that work in conjunction with sensors to open and close them automatically.

If you feel your window is taking longer than normal to down or up, it may be due to a faulty motor. Windows with motors usually have a sensor attached to determine if the glass is fully closed, so it does not need to know whether the glass is stuck or there is no power.

Only check for bad batteries when the window has full access as this could cause injury. You can test the windows by opening and closing each one independently and make sure they all work properly.

Another way to test if the windows work is to pull off any coverings such as shades or curtains and see if the window comes up or down easily.

Check the windows are not dirty

how to test window motor

While it is tempting to assume that your window motor is working correctly when it suddenly starts functioning, this is not a good idea!

If you check to see if your windows are clean, then it is likely that dirt has built up in the motors over time. This could cause corrosion which would affect how efficiently the motor functions.

Corrosion can also damage the metal parts of the motor so make sure to wash all of your windows with a glass cleaner or vacuum baggie before testing. If possible, test at both top and bottom level windows to get an accurate reading.

Once you have checked that these things are done, then try opening and closing each window as described above!”

Your motor should work quickly and smoothly without any hiccups or weird sounds. If it does not, take it back to the seller and report them! They may need to fix it themselves or send it for repair.

Test the windows for proper adjustment

how to test window motor

When switching between up or down positions, your window should go all the way up or down, respectively.

Does it? If not, then you may have a bad motor. Windows that climb an inch before shutting are usually due to poor friction in the track of the sash as it moves up.

You can test this by opening a door and either pulling it up very slowly or letting it fall very quickly (make sure nothing is blocking the door). If it takes too long for it to fully close or if it does not shut completely, then you probably have a bad window regulator.

Test the other part of the system by moving the handle side to side. It should move smoothly without any drag or resistance. You can also try turning the knob forward and backward – it should do so easily with no hesitation!

What if it doesn’t work at all? That would be another indication of a broken component.

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