Gates 33971 Engine Coolant Thermostat

Reliable Cooling with Gates Heavy-Duty Thermostat 33971

The Gates Heavy-Duty Thermostat 33971 is engineered to maintain optimal engine temperature for heavy-duty vehicles. Designed with durable brass and copper materials, this engine coolant thermostat ensures consistent performance under demanding conditions.

• Constructed from brass and copper for durability and corrosion resistance
• Bottom by-pass design with a jiggle pin weep hole for effective coolant flow
• Sealing flange outside diameter of 2.94 inches and height between flanges of 1.44 inches
• O-ring seal type with one seal included for secure installation
• Opens at 180°F (82°C) to regulate engine temperature precisely
• Height of 2.86 inches and by-pass flange diameter of 1.26 inches
• Includes one jiggle pin/check valve to prevent air lock

About the Gates Heavy-Duty Thermostat Product Line

The Heavy-Duty Thermostat line by Gates is designed specifically for commercial and industrial vehicle applications requiring robust cooling system components. This product line focuses on reliable temperature regulation and durability, making it suitable for engines operating under high stress and temperature variations. The 33971 thermostat exemplifies these qualities with its heavy-duty construction and precise temperature control features.

Detailed Product Description

The Gates 33971 engine coolant thermostat features a bottom by-pass design that allows coolant to circulate even when the thermostat is closed, preventing hot spots and ensuring uniform engine temperature. Its brass and copper construction offers excellent thermal conductivity and resistance to corrosion, extending the thermostat's service life. The O-ring seal provides a tight fit to prevent leaks, while the included jiggle pin weep hole helps release trapped air from the cooling system. With a start-to-open temperature of 180°F (82°C), this thermostat is calibrated to maintain optimal engine operating temperature, improving fuel efficiency and reducing engine wear.

Common Applications and Issues Addressed

• Prevents engine overheating by regulating coolant flow
• Reduces engine warm-up time for improved efficiency
• Helps avoid coolant leaks with reliable O-ring sealing
• Minimizes air lock in cooling system with jiggle pin design
• Supports heavy-duty vehicle engines requiring precise temperature control

Installation Notes and Tips

When installing the Gates Heavy-Duty Thermostat 33971, ensure the sealing flange and O-ring are clean and free of debris to prevent leaks. The bottom by-pass design requires proper orientation in the housing for correct coolant flow. Although no installation tool is included, standard thermostat installation tools compatible with heavy-duty thermostats can be used. Verify the thermostat opens at the specified temperature to confirm proper function before final assembly.

Quality Assurance and Warranty

Gates manufactures the 33971 thermostat to meet stringent quality standards for heavy-duty engine components. The use of brass and copper materials ensures durability and corrosion resistance. While specific warranty details are not provided, Gates products typically come with manufacturer-backed quality assurance to support reliable operation in demanding environments.