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I'm a new owner of a 2000 C5 with the optional sport seats.
The passenger seat lumbar and side bolsters work fine, but not the driver's.
On the driver's seat, the upper lumbar inflates but not the sides or the lower lumbar. The pumps appear to run. Is there a description of how the seat cover comes off for inspection?
Other than that, zero issues with this low mileage beauty.
Check out this thread. There is some excellent information in it on how the system works and suggested repairs with links to vendors that can supply replacement bladders.
It is an older thread, and some of the links are no longer active, but some new ones are added near the end, so do read the entire thread.
Here's an excellent video I found that walks you through the lumbar repair process on the seats.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.
Sport Seat Issues
