That's a big topic on all vehicles!
http://www.automotivetalk.net/showmessages.php?id=1409
I remember seeing it in my Ford E450 owners manuel.  Have you looked
in your owner's manuel?  have you asked on a Chevy fourm?  Have you
asked the guys are an auto shop or Chevy dealer?
I don't know the answer to your question.... other than that they are
almost always in the rear of the vehicle.  Hope you find it & I hope
that one of my suggestions might be of assistance.
evelyn

On Jan 29, 3:37 pm, robert.dick...@navy.mil wrote: