S10/T10 Blazer 2WD V6-4.3L VIN X (2003)
8. Avoid mix-positioning the drive belt by one or more grooves.
9. Confirm for the proper drive belt size and the correct drive belt routing by observing the location of the fix pointer and the index marks on the
drive belt tensioner. With a new drive belt installed the fix pointer should align within the indentation on the drive belt tensioner.
10. With a used drive belt installed the fix pointer should not align past the index mark.