Very simple as long as you get the correct wiper blades. The 2008 Toyota Sequoia has the newer style and more rare "pinch tab" wiper arms. See sources and related links below for installation videos. Also, purchase the replacement blades first and there will be additional instructions/illustrations on the replacement packages - note that not all wipers will fit on pinch tab arms so be sure to reference the make, model and year of your vehicle for the brand wipers you choose to purchase. Pinch-tab compatible wipers are a little bit trickier to find. Locate and press the tabs where the wiper blade meets the wiper arm then tip or rotate the wiper down out of the tab attachment, then rotate slightly so you can remove the little hook at the end out of the hole. The video below shows this in the reverse order but you'll get it.
The 2007 Toyota Sequoia has the most common hook-end wiper arms. See sources and related links below for installation videos. Locate and press the tab or button where the wiper blade is inserted into the hook of the wiper arm and pull wiper blade out of hook. You may have to rotate and flex the blade to make enough clearance for the hook to pass through.
Two 19" blades for the front and one 14" blade for the rear. You must go to the toyota dealer for the rear wiper blade but the front wiper blades are available aftermarket. See sources and related links below for more information.
The 2008 Toyota Sequoia has the newer-style pinch tab wiper attachments. See sources and related links below for wiper blade installation videos and correct wiper blades. Basically pinch the tabs on both sides of the attachment and swing that side of the blade downwards out of the arm, then remove it from the tiny hook.
It depends on if it has air conditioning or not
First, get the correct replacement wiper blades. They will have instructions on them. The 2004 Toyota Sequoia has hook-end wiper arms. There will be a little tab or button where the wiper blade is inserted into the hook on the arm. Press and pull wiper blade out of hook. Sometimes you have to rotate and flex the blade a little bit in order to create clearance. See video below for hook-end arms.
I do not see aftermarket replacement rear wiper blades nor rear wiper refills listed in the aftermarket wiper catalogs for the 2002 Toyota Sequoia. This would possibly indicate that the rear wiper was a proprietary technology/design and you may have to go to the dealer for the parts and possibly labor. Before doing this (because its usually a little more expensive going through the dealer), you may want to visit some internet forums and see if there's other ideas out there. Google "toyota sequoia forums" then search "rear wiper" once in the forums. I'm sure there's rapport on this topic. As far as front wiper blades, The 2002 Toyota Sequoia takes 19" replacement windshield wiper blades on both sides front and aftermarket wipers are available. Note, when buying wipers be sure to always lookup your vehicle make, model and year in the application guide book at the store, or now-a-days you can Google 'lookup wiper size'.
The 2004 Toyota Sequoia has the most common hook-end wiper arms. See sources and related links below for installation videos. Also, purchase the replacement blades first and there will be additional instructions/illustrations on the replacement packages. Locate and press the tab or button where the wiper blade is inserted into the hook of the wiper arm and pull wiper blade out of hook. You may have to rotate and flex the blade to make enough clearance for the hook to pass through.
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The bottom plastic piece pops open so the wiper can be stood straight up. The wiper then pops out like other wiper blades and can be replaced.
http://www.ehow.com/how_4454148_replace-wiper-blades-toyota-corolla.html