Defender. Manual — part 200
Climate Control System - General Information -
General data
Air conditioning
System type
CFC free expansion valve system
Compressor - V8 & Td5
NipponDenso 10PA17
Compressor - 300TDi
Sanden TRS105N
Fluids and lubricants
Item
Air conditioning refrigerant type
R134A
Air conditioning refrigerant quantity
V8
900 g ± 30 g
300 TDi
1100 g ± 50 g
Td5
750 g ± 50 g
Refrigerant oil type
NipponDenso ND-OIL8
Refrigerant oil quantity
180 ml (6.3 fl oz)
Torque wrench settings
Item
Nm
lbf.ft
Compressor to mounting bracket
25
18
Compressor pipe flange bolts
10
7
Receiver drier union bolts
6
4.5
Pressure cut-off switch
11
8
Pressure pipe union nuts - M16
14
10
Discharge pipe union nuts - M22
22
16
Suction pipe union nuts - M24
33
24
Climate Control System - General Information - Climate Control System
Description and Operation
COMPONENT LOCATION
• NOTE: left-hand drive (LHD) vehicle shown, right-hand drive (RHD) similar.
Item
Part Number
Description
1
-
Air inlet duct
2
-
Air intake and blower assembly
3
-
Heater assembly and controls
4
-
air conditioning (A/C) thermostatic switch
5
-
Water valve and bracket assembly
6
-
A/C refrigerant pressure switch
7
-
A/C evaporator
8
-
A/C thermostatic expansion valve
9
-
A/C receiver drier
10
-
A/C condenser assembly
11
-
A/C compressor
OVERVIEW
The climate control system features heating, and where fitted, A/C operations. Heating selections are made using the
left-hand (LH) rotary control mounted on the center console. The rotary control is connected via a Bowden cable to a
water valve in the engine cooling system. The water valve allows a varying amount of engine coolant to flow into the
heater matrix. The amount of coolant entering the heater matrix determines the heat transferred to the inlet air and
thus the amount of heat transferred into the cabin.
Blower motor speed is controlled using a 4 position sliding switch. The switch allows 3 blower motor speeds to be
selected by controlling the ground path for the blower motor in conjunction with a resistor pack. The blower motor and
resistor pack are both located in the engine compartment.
Air distribution into the cabin is selected using the right-hand (RH) rotary control mounted on the center console. Air
intake into the cabin is controlled by a 2 position sliding switch which is also located on the center console.
For additional information, refer to:
Air Distribution and Filtering
(412-01 Air Distribution and Filtering, Description and
Operation).
The A/C system is switched on and off using the switch located in the center console. The system will only operate when
the engine is running. If A/C is requested when blower motor speed is set to 0, blower motor speed 1 will be engaged
automatically.
The engine control module (ECM) monitors the engine running status and suspends A/C operation if necessary by
inhibiting the compressor clutch relay.
The heated seats, heated windshield, and heated rear window systems are not part of the climate control system.For
additional information, refer to:
Seats
(501-10 Seating, Description and Operation),
Glass, Frames and Mechanisms
(501-11 Glass, Frames and Mechanisms, Description and Operation).
AIR INLET DUCT
Item
Part Number
Description
1
-
Air inlet
2
-
Air outlet to blower assembly
The air inlet duct is mounted in the passenger side front fender. Air is drawn into the air inlet duct through a vent on
the upper surface of the fender. The air inlet duct directs air into the air intake and blower assembly. The air intake and
blower assembly features a Bowden cable operated flap which allows the user to switch between fresh or recirculated air
entering the cabin.
AIR INTAKE AND BLOWER ASSEMBLY
Item
Part Number
Description
1
-
Blower motor
2
-
Resistor pack
3
-
Fresh/recirculated air flap
The air intake and blower assembly is mounted on the passenger side of the engine compartment. The blower comprises
a centrifugal fan powered by an electric motor. The motor is able to operate at 3 speeds, which are controlled by a
resistor pack mounted on the inboard side of the blower motor casing. Air leaving the air intake and blower assembly is
directed into the rear of the heater assembly.
HEATER ASSEMBLY
Item
Part Number
Description
1
-
Diffuser plate
2
-
Windshield/face level air distribution door cam
3
-
Footwell air distribution door cam
4
-
Heater matrix
The heater assembly is mounted behind the instrument panel on the vehicle center line. The heater assembly contains
an aluminum heater matrix and a diffuser plate to deliver the required air temperature into the cabin. If the vehicle is
fitted with A/C, the A/C evaporator replaces the diffuser plate in the heater assembly.
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