Mercury 1999 Villager - Manual (Page 26)

The rear A/C fan speed control allows the rear passengers to control the
volume of air that is distributed from the rear registers.
The rear seat A/C system is controlled from the main climate control
system on the instrument panel.
0
1
2
3 4
REAR
A/C
OFF REAR A/C 1 2 3 4
1
MAX
A/C
OFF
2
3
4
A/C
Controls and features
26