Gates 33889 Engine Coolant Thermostat

Reliable Engine Coolant Thermostat for Chevrolet and GMC Vehicles

The Gates OE Type Thermostat 33889 is engineered to maintain optimal engine temperature for Chevrolet and GMC models including Blazer, Tahoe, Yukon, and various Suburban and C/K series trucks. Designed with durable stainless steel and copper materials, this thermostat ensures consistent performance and longevity.

• Constructed from stainless steel and copper for durability
• Bottom by-pass design with a jiggle pin weep hole for pressure regulation
• Start to open temperature at 195°F (91°C) for precise engine temperature control
• Sealing flange outside diameter approximately 2.51 inches for proper fitment
• Compatible with Chevrolet and GMC trucks and SUVs including C1500, K1500, C2500, K2500, and more

About the Gates OE Type Thermostat Product Line

The OE Type Thermostat line by Gates is designed to meet original equipment specifications, providing reliable engine temperature regulation and compatibility with factory cooling systems. This product line focuses on delivering OE performance standards, ensuring that the thermostat operates within the exact temperature range and physical dimensions required by the vehicle manufacturer.

Product Details and Specifications

The Gates 33889 thermostat features a bottom by-pass design that includes a jiggle pin weep hole to allow air to escape and prevent airlock in the cooling system. The thermostat starts to open at 195°F (91°C), which helps maintain optimal engine operating temperature and prevents overheating. The sealing flange outside diameter measures approximately 2.51 inches, with a flange thickness of 0.05 inches, ensuring a secure and leak-free fit. The height between flanges is about 1.6 inches, and the overall height ranges from 2.28 to 2.3 inches. This thermostat does not include gaskets or installation tools, so ensure proper sealing and tools are available during installation.

Compatible Vehicles and Applications

• Chevrolet Blazer, Tahoe, Yukon
• Chevrolet C1500, C1500 Suburban, C2500, C2500 Suburban, C3500
• GMC Jimmy, K1500, K1500 Suburban, K2500, K2500 Suburban, K3500
• GMC G30, P30, P3500, Savana 2500, Savana 3500

Common Issues Addressed by This Thermostat

• Engine overheating due to thermostat failure
• Poor engine warm-up performance
• Coolant leaks around the thermostat housing
• Inconsistent engine temperature regulation
• Air trapped in the cooling system causing inefficient cooling

Installation Notes and Tips

Before installation, verify compatibility with your specific Chevrolet or GMC model. The thermostat does not include gaskets or installation tools, so use OEM or compatible gaskets and appropriate tools to ensure a proper seal. The jiggle pin weep hole should be oriented correctly to allow air to escape during coolant circulation. Follow vehicle manufacturer torque specifications for the thermostat housing bolts to avoid leaks or damage.

Quality Assurance and Warranty

The Gates OE Type Thermostat 33889 is manufactured to meet OE performance standards, ensuring reliable operation and durability. While specific warranty details are not provided, Gates products typically come with a limited warranty against defects in materials and workmanship. Refer to the product packaging or manufacturer documentation for exact warranty terms.