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It the fan stops blowing for a second and then works again ,this is the sign of you blower motor going out/bad.
If you want to check/replace the cabin filter ,it is located behind of the glove box ,there is a rectangular plastic cover that you need to remove to access the filter.
Also need to open the glove box all the way , towards the floor ,disconnect the little shock on the side of the glove box and then force the top corners of the glove box to get the tabs off , the side of the box.
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