GMC 2000 Sierra - Manual (Page 213)

yellow blue
4-17
To replace the lower air dam:
1. Line up each push - pin
with it’s intended
retainer and push the
washer portion of the
push
- pin towards the
retainer until it locks
into place
2. Push the flat end of the
push - pin towards the
retainer until it locks
into place, making sure
each is secure.