Lexus RX300 (MCU15). Service manual — part 183

CO07U–02

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COOLING

COOLANT

CO–1

LEXUS RX300 (RM785E)

COOLANT

INSPECTION

1.

CHECK ENGINE COOLANT LEVEL AT RADIATOR RESERVOIR

The engine coolant level should be between the ”LOW” and ”FULL” lines, when the engine is cold.
If low, check for leaks and add engine coolant up to the ”FULL” line.
2.

CHECK ENGINE COOLANT QUALITY

(a)

Remove the radiator cap from the radiator.

CAUTION:
To avoid the danger of being burned, do not remove the radiator cap while the engine and radiator
are still hot, as fluid and steam can be blown out under pressure.
(b)

There should not be any excessive deposits of rust or scale around the radiator cap or radiator filler
hole, and the coolant should be free from oil.

If excessively dirty, clean the coolant passages and replace the coolant.
(c)

Reinstall the radiator cap.

B12248

Drain Plug

Drain Plug

CO07V–03

CO–2

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COOLING

COOLANT

LEXUS RX300 (RM785E)

REPLACEMENT

1.

REMOVE ENGINE UNDER COVER

2.

DRAIN ENGINE COOLANT

(a)

Remove the radiator cap.

CAUTION:
To avoid the danger of being burned, do not remove the ra-
diator cap while the engine and radiator are still hot, as fluid
and steam can be blown out under pressure.
(b)

Loosen the radiator drain plug and engine drain plugs,
and drain the coolant.

(c)

Close the drain plugs.
Torque: 13 N·m (130 kgf·cm, 9 ft·lbf) for engine

3.

FILL ENGINE COOLANT

(a)

Slowly fill the system with coolant.

S

Use a good brand of ethylene–glycol base engine
coolant and mix it according to the manufacturer’s
directions.

S

Using coolant which includes more than 50 % ethyl-
ene–glycol (but not more than 70 %) is recom-
mended.

NOTICE:

S

Do not use an alcohol type coolant.

S

The coolant should be mixed with demineralized wa-
ter or distilled water.
Capacity:
9.0 liters (9.5 US qts, 7.9 lmp. qts)

(b)

Install the radiator cap.

(c)

Start the engine, and bleed the cooling system.

(d)

If necessary, refill coolant into the reservoir up to the
”FULL” line.

4.

CHECK ENGINE COOLANT FOR LEAKS

5.

REINSTALL ENGINE UNDER COVER

CO07W–03

B12311

N·m (kgf·cm, ft·lbf)

: Specified torque

LH Wiper Arm and Blade Assembly

Hood to Cowl Top Seal

Wiper Motor with Wiper Link

Outer Cowl Top Panel

x 6

Wiper Motor Connector

24 (245, 18)

RH Cowl Top
Ventilator Louver

LH Cowl Top Ventilator Louver

RH Wiper Arm and Blade Assembly

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COOLING

WATER PUMP

CO–3

LEXUS RX300 (RM785E)

WATER PUMP

COMPONENTS

B12312

RH Fender Apron Seal

Generator Drive Belt

Engine Moving
Control Rod

No.2 RH Engine

Mounting Bracket

Ground Strap

PS Pump Drive Belt

64 (650, 47)

32 (320, 23)

N·m (kgf·cm, ft·lbf)

: Specified torque

Front Upper
Suspension Brace

80 (810, 59)

64 (650, 47)

80 (810, 59)

Master Cylinder Reservoir

Cruise Control Actuator

Cruise Control Actuator
Connector

CO–4

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COOLING

WATER PUMP

LEXUS RX300 (RM785E)