Lexus RX300 (MCU15). Service manual — part 63

BE

BODY ELECTRICAL — AIR CONDITIONER

187BE24

187BE25

187BE27

187BE28

187BE26

125

3. Air Outlets and Air Volume Ratios

187BE29

I

J

K

L

H

G

F

C

D

E

B

A

M

M

J

LHD Model

Air Outlet

Register

Footwell

Defroster

Air Outlet
M d

Available Mode

Front

Rear

Footwell

Defroster

Mode

Auto-

matic

Manual

Center

Side

Center

Front

Rear

Front

Side

FACE

F

F

f f f

BI-LEVEL

F

F

f

f

f

f

f

FOOT

F

f

f f

FOOT

F

f

f f

f

f

FOOT/DEF

F

f

f

f

f

f

DEF

F

f

f f

Air Outlet Position Symbol

B, C

A, D

I

F, H

G, E

K, L

J, M

The size of the circle

f indicates the proportion of air flow volume.

BODY ELECTRICAL — AIR CONDITIONER

126

4. System Diagram

187BE30

+B
+IG

Servomotor (for Air Inlet Control)

Heater
Relay

Blower
Motor

Blower Motor
Controller

Evaporator Temp. Sensor

Servomotor (for Air Mix Control)

Servomotor (for Mode Control)

Solar Sensor

Room Temp. Sensor

Ambient Temp. Sensor

+B

IG

BLW

S5-2

SG-2

TPI
AIF
AIR

S5–1

TP
AMC
AMH

TPO
AOF
AOD

SG-1

TS

S5-3

TR
SG-3

TAM

SG-5

TE

MPX+

GND

MPX–

A/C and
Combination
Meter
Integrated
ECU

Rear
Window
Deffoger
Relay

Body ECU

BEAN

BEAN

Engine
ECU

BEAN

BEAN

Center Cluster
Integrated Panel
ECU

AVC-LAN

Multi
Display

Magnet
Clutch
Relay

Water
Temp.
Sensor

Magnetic
Clutch

A/C
Pressure
Switch

A/C
Compressor
Lock
Sensor

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BODY ELECTRICAL — AIR CONDITIONER

127

JCONSTRUCTION AND OPERATION

1. Air Conditioner Control Panel (Center Cluster Integrated Panel Switch)

D The control switches for the air conditioner have been provided on the center cluster integrated panel

to ensure the ease of use.

D The operating conditions of the air conditioner are shown on the multi display screen that excels in visibili-

ty.

187BE32

LHD Model

2. Air Conditioner Unit

General

A semi-center location air conditioner unit, in which the multi-tank, super-slim structure type evaporator
and straight flow (full-path flew) heater core are placed in the vehicle’s longitudinal direction, has been
adopted.

187BE39

Front

Heater Core

Evaporator

BODY ELECTRICAL — AIR CONDITIONER

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128

Heater Core

The flow of the heater water in the heater core has
been adopted a straight flow (full-pass flow). A alu-
minum flat tube type heater core is used.

Evaporator

By placing the tanks at the top and the bottom of the evaporator unit and by adopting an inner fin construc-
tion, the heat exchanging efficiency has been improved and the evaporator unit’s temperature distribution
has been made more uniform. As a result, it has become possible to realize a thinner evaporator construction.
Furthermore, the evaporator body has been coated with a type of resin that contains an antibacterial agent
in order to minimize the source of foul odor and the propagation of bacteria.

163BE17

Aluminum
Matrix

Inner Fin

Antibacterial Agent

Nylon Layer

Chromate
Layer

3. Condenser

General

The RX300 has adopted sub-cool condenser in which a multi-flow condenser (consisting of two cooling
portions: a condensing portion and a super-cooling portion) and a gas-liquid separator (modulator) have
been integrated. This condenser has adopted the sub-cool cycle for its cooling cycle system to improve
the heat exchanging efficiency.