Chevrolet 2006 HHR Owner's Manual page 15

3. Use one of two levers to fold the seat flat. The levers
are located on the rear of the seat near the bottom
of either side of the seat. Pull up on either lever and
fold the seat forward until the seatback disengages.
This can most easily be down from the rear seats.
4. Continue to fold the seat forward until it locks in the
folded position. Pull up on the seatback to be sure
it is locked.
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