Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2004 Lexus LS 430FACTORY OEM SERVICE PROCEDURE

Engine Cooling: Service: Specifications

COOLING SYSTEM SPECIFICATIONS

Application

Specification

Coolant Replacement Interval ⁽¹⁾

First Time

100,000 Miles

Subsequent

50,000 Miles

Coolant Capacity ⁽²⁾

10 Qts. (9.5L)

Radiator Cap

Standard Pressure

13.5-17.8 psi (.95-1.25 kg/cm2)

Minimum Pressure

11.4 psi (.8 kg/cm2)

Thermostat Opening Temperature ⁽³⁾

176-183°F (80-84°C)

⁽¹⁾	Use Toyota Super Long Life Coolant.

⁽²⁾	Includes heater core capacity.

⁽³⁾	Thermostat valve lift should be .39 in. (10 mm) or more at 203°F (95°C).

THERMOSTAT R & I

For removal and installation, see THERMOSTAT .

WATER PUMP R & I

For removal and installation, see WATER PUMP .

Factory Service Tools

Use the Manual With the Right Hardware

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.