Chevrolet 1998 Astro Owner's Manual page 279

6. Grasp the top of the heater duct and pull down gently
to remove it.
7. Remove the two bolts at the engine cover. The bolts
are not supposed to come out of the cover, only from
the front of the dash.
When removing the cover, be careful not
to
damage
the instrument panel or the trim.
8. Disconnect the AM radio ground strap.
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