L322 Range Rover System Description and Operation
AIR CONDITIONING
82-16
DESCRIPTION AND OPERATION
Heater matrix
The same heater matrix is used in both the low and high line heater assemblies. The heater matrix is internally divided
into two separate halves, with separate coolant inlets for each half and a common coolant outlet. On the low line
system, the two coolant inlets are connected to a common feed from the single coolant valve. On the high line system,
each coolant inlet pipe is connected to a feed from a separate coolant valve.
Heater Matrix Assembly
1 Low line connecting pipes
2 High line connecting pipes
Control Flaps
Control flaps in the heater assembly control the source of inlet air and the distribution and temperature of outlet air.
On both the low and high line heater assemblies, a fresh/recirculated air flap is installed in the air inlet on each side
of the heater assembly. A stepper motor drives the LH fresh/recirculated air flap and a Bowden cable transmits the
drive from the LH to the RH fresh/recirculated air flap. On the high line system, a ram air flap is installed inside each
fresh/recirculated air flap. A stepper motor drives the RH ram air flap and a Bowden cable transmits the drive from the
RH to the LH ram air flap.
Each side of the heater assembly contains separate distribution flaps for the footwell, face level and windscreen. The
related flaps on each side of the heater assembly are installed on common drive spindles. On the low line heater
assembly, the distribution flaps are driven by Bowden cables connected to a cam mechanism, which, in turn, is driven
by a stepper motor. On the high line heater assembly, each set of distribution flaps is driven by a separate stepper
motor.
On both the low and high line heater assemblies, a blend flap is installed below the face level outlets. The blend flap
is driven by a Bowden cable connected to a thumbwheel on the centre face vents in the fascia, and allows the
temperature of face level air to be modified with cold air direct from the evaporator.