Honda 2008 Ridgeline Owner's Manual page 139

Dual Temperature Control
To set the driver's side temperature
differently than the passenger's,
press the DUAL button, then turn
DRIVER'S SIDE PASSENGER'S SIDE
the driver's control dial. To set the
passenger's side differently than the
driver's, turn the passenger's control
dial. You can adjust the passenger's
side without pressing the DUAL
button first.
When you set the temperature to its
lower or upper limit, it is displayed as
or .
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