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When the red sleeve shows in the window, the air filter is clogged. the indicator is connected to the engine side of the air filter, and the increase in vaccum causes the indicator to trip. It can be reset by pushing in the button on the end.

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Q: 2003 Tahoe Z71 There is an indicator for the air filter How do you read the indicator to determine when it's time to change the filter The manual is of no help?
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