Lotus Elise Service Notes page 453

Lotus Service Notes Section OG
Air Distribution Plenum
The air distribution plenum is mounted on the top of the chassis, sandwiched between the scuttle and the
windscreen frame demist duct. Air is ducted into the plenum from the blower fan via flexible trunking, and
flows from the unit into further individual lengths of trunking to the four face level vents, each of which is fitted
with its own volume and direction controls.
The plenum contains two vacuum operated flaps to control airflow to the footweli and windscreen vents:
Footweli: A vacuum actuator mounted within the plenum is connected to a flap on the floor of the unit to control
airflow to the footweli vents. The default position of the flap is to close the footweli vent, with vacuum being
required to open the port.
Screen: A vacuum actuator mounted externally on the passenger side of the plenum, is connected via two rods
and a bellcrank lever to a screen flap which controls airflow into the demist duct to which the plenum is mated.
The default position of the flap is to open the demist duct, with vacuum required to close the port.
The plenum is a bonded assembly which is not dismantlable. Service is only by replacement of the
complete assembly.
Footweli flap
actuator Outlet trunking
>000 / 04
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