Gates 33737 Engine Coolant Thermostat

Reliable Engine Cooling with Gates OE Type Thermostat 33737

The Gates OE Type Thermostat 33737 is engineered to maintain optimal engine temperature for select INFINITI, Mercury, and Nissan vehicles. Designed with durable stainless steel and copper materials, this engine coolant thermostat ensures consistent performance and longevity.

• Constructed from stainless steel and copper for durability
• Reverse poppet design for precise temperature regulation
• Start to open temperature at 170°F (77°C) for accurate engine warm-up
• Includes a jiggle pin weep hole to prevent air lock
• Sealing flange outside diameter approximately 2.51 to 2.52 inches
• Compatible with multiple Nissan and INFINITI models including 300ZX, Maxima, Pathfinder, and more

Product Line Overview: Gates OE Type Thermostat

The Gates OE Type Thermostat line is designed to meet original equipment (OE) specifications, providing reliable engine temperature control that matches factory performance. This thermostat 33737 maintains OE comparison rating, ensuring it functions as intended in the cooling system without compromising engine efficiency or durability.

Detailed Product Description

This engine coolant thermostat features a reverse poppet design, which allows for precise control of coolant flow based on engine temperature. The thermostat starts to open at 170°F (77°C), helping the engine reach optimal operating temperature quickly and maintain it effectively. The stainless steel and copper construction offers corrosion resistance and durability under high-temperature conditions. The jiggle pin weep hole helps eliminate air pockets in the cooling system, improving coolant circulation and preventing overheating. With a sealing flange outside diameter of approximately 2.51 to 2.52 inches and a flange thickness of 0.05 inches, this thermostat fits securely within the housing.

Compatible Vehicles and Applications

• INFINITI models: J30, M30, QX4, Villager
• Mercury models: Villager, Mountaineer (if applicable)
• Nissan models: 200SX, 300ZX, D21, Frontier, Maxima, Pathfinder, Pickup, Quest, Xterra

This thermostat is ideal for replacing worn or malfunctioning thermostats in these vehicles to maintain proper engine temperature and prevent cooling system issues.

Common Issues Addressed by This Thermostat

• Engine overheating due to stuck closed thermostat
• Poor heater performance from thermostat stuck open
• Inconsistent engine temperature regulation
• Coolant flow interruptions caused by air pockets
• Premature engine wear from improper temperature control

Installation Notes and Tips

Installation of the Gates OE Type Thermostat 33737 requires removal of the old thermostat and cleaning of the housing surface to ensure a proper seal. Note that this part does not include a gasket or installation tool, so reuse the existing gasket if in good condition or replace it with a compatible gasket. Verify the jiggle pin orientation during installation to maintain proper air bleed function. Follow vehicle-specific service manual instructions for torque specifications and coolant system bleeding procedures.

Quality Assurance and Warranty

The Gates OE Type Thermostat 33737 is manufactured to meet OE performance standards, ensuring reliable operation within the cooling system. While specific warranty details are not provided, Gates products typically adhere to strict quality control processes to deliver consistent performance and durability.