Lexus SC300 / Lexus SC400. Service manual — part 14

Air Inlet Control System

(When the AUTO Switch is ON)
(a) The desired temperature is set using the TEMP switch.
(b) From the input signals (room temperature sensor, ambient temperature sensor and solar sensor) and the

temperature setting, the air conditioner control ECU determines the air inlet and outputs signals to the air
inlet servomotor assembly.

(c) When it receives signals from the ECU, the air inlet servomotor opens or closes the damper to change the

air inlet. When the air inlet is changed to the desired setting, it is detected by the air inlet damper position
sensor and the ECU stops the servomotor.

HINT: If the Mode switch is set on DEF, the ECU forcedly changes the air inlet to FRS.

(When the AUTO Switch is OFF)
The ECU fixes the air inlet according to the position of the manual switch.

AC–12

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AIR CONDITIONING SYSTEM

Description

Part No.

Part Name

Note

07110-58011

(07117-58010)

(07117-78011)

(07117-88013)

(07117-88022)

(07117-88040)

07110-58040

07112-66040

07112-76060

07114-82020

07117-48050

Air Conditioner
Service Tool Set

(Refrigerant Drum
Service Valve)

(Refrigerant
Charging Gauge)

(Refrigerant
Charging Hose)

(Refrigerant
Charging Hose)

(Refrigerant
Charging Hose)

(Stop Valve)

Charging Hose Kit.
w/Stop Valve

Magnetic Clutch
Stopper

Magnetic Clutch

Remover

Snap Ring Pliers

Vacuum Pump Assy

Orange Color

If you require a stop valve, please order this kit.

Rated voltage AC220V

Illustration

Illustration

Part No.

Part Name

Note

09082-00015

TOYOTA
Electrical Tester

Measure voltage currant and resistance

Blue Color

Green Color

PREPARATION

SST (SPECIAL SERVICE TOOLS)

–

AIR CONDITIONING SYSTEM

Preparation

AC–13

EQUIPMENT

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Note

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Voltmeter

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Measures voltage

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Ammeter

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Measures current

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Ohmmeter

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Measures resistance

LUBRICANT

Item

Capacity

Classification

Item

cc

fl. oz

Classification

Compressor oil
When replacing receiver
When replacing condenser
When replacing evaporator

20

40–50
40–50

0.7

1.4–1.7
1.4–1.7

ND OIL 6,
SUNISO No. 5GS or equivalent

AC–14

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AIR CONDITIONING SYSTEM

Preparation Cooling System

USE OF MANIFOLD GAUGE SET

INSTALLATION OF MANIFOLD GAUGE
SET

HINT: To prevent releasing refrigerant, use charging hoses
with a stop valve when installing the manifold gauge set to
service valves on the refrigerant line.

1.

CONNECT CHARGING HOSES WITH A STOP VALVE TO
MANIFOLD GAUGE SET
Tighten the nuts by hand.

CAUTION:

•

Do not connect the wrong hoses to the high
pressure and the low pressure sides.

•

To prevent loosening the nuts, do not apply
compressor oil to seat of the connection.

2.

CLOSE HAND VALVES OF BOTH STOP VALVES

3. CLOSE BOTH HAND VALVES OF MANIFOLD GAUGE

SET

4. REMOVE CAPS FROM SERVICE VALVES ON

REFRIGERANT LINE

5. CONNECT

STOP

VALVES

TO

SERVICE

VALVES

Tighten the nuts by hand.
CAUTION:

•

Do not connect the wrong hoses to the high
pressure and the low pressure sides.

•

To prevent loosening the nuts, do not apply
compressor oil to seat of the connection.

6.

OPEN HAND VALVES OF BOTH STOP VALVES

REMOVAL OF MANIFOLD GAUGE SET

1. CLOSE BOTH HAND VALVES OF MANIFOLD GAUGE

SET

2.

CLOSE HAND VALVES OF BOTH STOP VALVES

3.

DISCONNECT STOP VALVES FROM SERVICE VALVES
ON REFRIGERANT LINE

4.

INSTALL CAPS TO SERVICE VALVES ON REFRIGERANT
LINE

–

AIR CONDITIONING SYSTEM

Use of Manifold Gauge Set

AC–15