Discovery 2. Manual - part 715

 

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Discovery 2. Manual - part 715

 

 

AIR CONDITIONING

DESCRIPTION AND OPERATION

82-23

DESCRIPTION AND OPERATION

Rear A/C refrigerant system component 
layout

Rear evaporator/blower assembly
Refrigerant lines
Connections to front A/C system

AIR CONDITIONING

82-24

DESCRIPTION AND OPERATION

Rear A/C distribution and control 
component layout

Control panel
Rear evaporator/blower assembly
Air distribution ducts
Vent assembly

AIR CONDITIONING

DESCRIPTION AND OPERATION

82-25

Description

The rear air conditioning system cools and recirculates air at the rear of the cabin. The system consists of refrigerant 
lines, a rear evaporator/blower assembly, a distribution system and a control panel.

Cooled air from the rear evaporator/blower assembly is supplied by the distribution system to vent outlets above each 
second and third row seat. The system is controlled by two switches on the control panel.

Refrigerant lines
Two refrigerant lines connect the rear evaporator/blower assembly to the front A/C refrigerant system. The lines are 
routed along the LH underside of the vehicle and secured to a connector block in the floor. A heat shield protects the 
lines where they pass above the rear silencer.

Rear evaporator/blower assembly

Resistor pack
Thermostatic expansion valve
Rear blower relay
Air outlet
Evaporator

Capillary tube
Housing
Condensate drain outlet
Refrigerant lines

10 Blower

AIR CONDITIONING

82-26

DESCRIPTION AND OPERATION

The rear evaporator/blower assembly cools and dehumidifies air from the cabin and supplies it to the rear distribution 
system. The unit is installed on the left side of the loadspace, behind the quarter trim. A grille in the quarter trim allows 
air to flow from the loadspace into the evaporator/blower. Refrigerant lines for the evaporator and a condensate drain 
tube are attached to the rear floor.

The evaporator and blower are installed in a common housing, which also incorporates the resistor pack for the 
blower. A thermostatic expansion valve is integrated into the inlet refrigerant line. A rear blower relay is attached to 
the top of the housing.

Evaporator
The evaporator absorbs heat from the recirculated air being supplied to the distribution ducts.

Thermostatic expansion valve
The thermostatic expansion valve meters the flow of refrigerant into the evaporator to match the heat load of the air 
passing through the evaporator matrix. A capillary tube, attached to the outlet pipe of the evaporator and connected 
to the thermostatic expansion valve, automatically adjusts the valve opening in relation to the refrigerant temperature 
at the evaporator outlet.

Blower
The blower controls the volume of air being supplied to the distribution outlets. The blower is an open hub, centrifugal 
fan powered by an electric motor. A dust filter is installed over the fan inlet. The blower switch on the control panel 
and the resistor pack control the operation of the blower, which can be selected to run at one of four speeds.

Resistor pack
The resistor pack supplies reduced voltages to the blower motor for blower speeds 1, 2 and 3. For blower speed 4, 
the resistor pack is bypassed and battery voltage drives the motor at full speed. The pack is installed in the air outlet 
from the blower fan, so that any heat generated is dissipated by the air flow.

Distribution system

Air ducts
Ducts connected to the rear evaporator/blower motor assembly distribute air to five vent assemblies in the roof.

Vent assemblies
The vent assemblies allow occupants to control the flow and direction of air. Each vent assembly incorporates a 
thumbwheel to regulate flow and moveable vanes to control direction.

Rear control system
The control system operates the blower to control the operation of the rear A/C. The control system consists of two 
control switches and a rear blower relay.

Control switches
A rear A/C switch and a blower speed switch are installed on a control panel in the roof lining. The A/C switch is a 
latching pushswitch with an amber indicator lamp which illuminates when rear A/C is selected on. The blower speed 
switch is a slide switch with a positive detent at each of four speed positions (there is no off position).

Rear blower relay
The rear blower relay controls the electrical supply to the blower.

 

 

 

 

 

 

 

Content   ..  713  714  715  716   ..