Windscreen; Temperature Control; Interior Fan; Re-Circulation Switch - Lotus Evora Service Notes

Lotus Service Notes

Windscreen

Temperature Control

The rotary temperature control actuates the air blender flap, which dictates the proportion of the airflow
which is directed through the heater matrix. With the control knob fully clockwise at the coldest position, the
heater matrix is fully shut off. As the control is turned counterclockwise, the flap is moved to allow some airflow
through the heater matrix, until at the fully hot position, all airflow is directed through the matrix for maximum
heating.

Interior Fan

The lowermost of the rotary controls, allows the selection of 4 speeds for the interior fan, and functions
with the key at the accessory or ignition positions. Turned fully clockwise, the fan is switched off. Turning the
knob counterclockwise through 4 detent positions provides increasing fan speed and airflow delivery. Note that
the air conditioning will not function until a fan speed is manually selected.

Re-circulation Switch

This switch functions with the key at the accessory or ignition positions, and will maintain its status through-
out ignition cycles.
The re-circulation port in the footwell toe-board is open at all times, such that the greater proportion of air
drawn into the fan chamber, via a duct incorporated into the bottom of the HVAC housing, is always from the
cabin interior. The fresh air intake on the top of the unit is controlled by a stepper motor and flap valve, and is
normally open to provide approximately 30% fresh airflow. To close the intake and prevent fumes being drawn
into the cabin, or to provide the quickest response to temperature change requests, the fresh air intake may
be closed off by pressing the re-circ. switch, to result in 100% re-circulation. This option should, however, be
used sparingly to avoid stuffiness in the cockpit.
Air Conditioning Switch
The engine must be running for the a.c. to operate. This switch signals the engine ECU with an air condi-
tioning request, and will maintain its status throughout ignition cycles. The ECU determines whether the running
conditions allow for compressor activation. Conditions which will inhibit a.c. include:
- near full throttle demand;
- excessive coolant temperature;
- any fault codes set;
- low refrigerant pressure.
When appropriate, the ECU will activate the a.c. by applying a duty cycle to the compressor solenoid valve,
thus generating a swash plate angle and initiating refrigerant flow.
Demist Switch
In order to allow a single touch selection of demist/defrost settings, a dedicated switch is provided. The
switch is operative only with ignition on, and will default off at the next ignition cycle. When activated:
Page 8
To windscreen vent ducting
in underside of fascia top panel
Section PN
Airflow from
HVAC unit