Gates 34003 Engine Coolant Thermostat

Reliable Engine Coolant Thermostat for Lexus Vehicles

The Gates OE Type Thermostat 34003 is engineered to maintain optimal engine temperature for select Lexus models. Designed with durable materials and precise specifications, this thermostat ensures efficient coolant flow and temperature regulation.

• Constructed from stainless steel, brass, and copper for durability
• Reverse poppet design for reliable operation
• Start to open temperature at 180°F (82°C) for accurate thermal control
• Sealing flange outside diameter approximately 2.04 to 2.05 inches
• Includes a jiggle pin weep hole to prevent air lock
• Compatible with Lexus IS F, LS460, LS600h, and LX570 models

About the Gates OE Type Thermostat Product Line

The OE Type Thermostat line by Gates is designed to meet original equipment performance standards. This product line focuses on delivering thermostats that match the exact specifications and quality of factory-installed parts, ensuring proper fit and function for vehicles like the Lexus IS F and LS series. The 34003 thermostat exemplifies this approach with its precise temperature activation and robust construction.

Product Details and Specifications

The Gates 34003 thermostat features a reverse poppet design that enhances coolant flow control and reduces the risk of overheating. Its stainless steel, brass, and copper materials provide corrosion resistance and long service life. The thermostat starts to open at 180°F (82°C), which aligns with the thermal requirements of Lexus engines. The sealing flange outside diameter measures between 2.04 and 2.05 inches, with a flange thickness of 0.05 inches, ensuring a secure seal within the cooling system. Additionally, the jiggle pin weep hole helps release trapped air, improving coolant circulation and system efficiency.

Applications and Common Issues Addressed

• Maintains proper engine operating temperature in Lexus IS F, LS460, LS600h, and LX570
• Prevents engine overheating caused by thermostat failure
• Eliminates coolant flow restrictions due to stuck or faulty thermostats
• Reduces engine warm-up time for improved performance
• Helps avoid coolant leaks by providing a precise seal without additional gaskets

Installation Notes and Tips

This thermostat does not include an installation tool, so using the appropriate tools for your Lexus model is recommended. Ensure the sealing flange is clean and free of debris before installation to maintain a proper seal. Verify the jiggle pin is unobstructed to allow air to escape during coolant system bleeding. Follow vehicle-specific service manual instructions for thermostat replacement to avoid damage and ensure correct fitment.

Quality Assurance and Warranty

The Gates OE Type Thermostat 34003 is manufactured to meet OE performance standards, providing reliable operation and durability. While specific warranty details are not provided, Gates products typically adhere to strict quality control processes to ensure consistent performance in automotive cooling systems.