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The lint build up on the blower wheel occurs due to back pressure on the vent system not allowing the lint to exit quick enough. Your vent may just be long or have too many twists and turns to get outside, or the vent may be partially clogged and needs to be cleaned out through your house. Other than that, if you're handy you can take the dryer apart yourself and clean the blower fan wheel if you'd like.
Below is a video on how to access it so you can clean it if you need a step by step tutorial.
CLICK HERE for video
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