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Poor vision-aside from slippery roads, the impaired ability to see is what drivers dislike the most when driving through the rain. But if that wasn't awful enough, things can still go from bad to worse if your wiper arms give out while you're in the middle of a heavy downpour. When that happens, the little visibility you have can drop down to zero. Of course, you wouldn't want to find yourself in such a scenario. To avoid that, regularly check the condition of your wiper arms. If one is already showing signs of being slow or something similar, then it's time to replace it. Ideally though, it's best to replace both arms since it's pretty much guaranteed that the other will soon find itself in the same condition.
Park your car on a level surface and choose to work in an area where there's sufficient lighting. Afterwards, make sure that the switch for the wipers is turned off.
Once the safety precautions are out of the way, lift both wiper arms (as if you're going to clean the windshield). The next step is to remove one of the old arms. The process may differ depending on the type of wiper you have. If your wipers aren't held by bolts, then all you have to do to remove the arm is to pry it off using a special wiper removal tool or a small screwdriver.
If your wipers are secured by bolts, then the process will take a little more effort. Before you can start removing the bolt from one of the wipers, you'll have to take off the cover that conceals the bolt. You can do that with the help of the screwdriver. Once the cover is gone, grab your socket and remove the bolt. You should be able to remove the old wiper arm afterwards.
Now that the old wiper arm has been taken out, you can proceed to installing the new one. Refer to the other wiper arm (the one that has yet to be replaced) to make sure that the new wiper arm is positioned properly. After that, secure it with the bolt that you removed earlier on (this is obviously only applicable to those that have bolted wipers).
Follow the same steps for the other wiper arm.