Ford 1996 Windstar Manual page 37

Fasten both halves of the chest clip below the child's
7.
shoulders and adjust it to comfortably hold the shoulder
belts in place on the child's chest. The color green must
appear in the indicator window when fastened. (The purpose
of this clip is to position the shoulder belts correctly on the
child's shoulders.) Refer to Figure 6.
If both tongues do not latch in the buckle, do not use the
child seat. See your dealer for repairs.
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