Gates 33889 Engine Coolant Thermostat

OE Type Thermostat for GM Cooling Systems

Gates 33889 is an OE Type Engine Coolant Thermostat built for precise temperature control and a leak-free OEM-equivalent fit. It is a 195-degree thermostat for select Chevrolet and GMC trucks, vans, SUVs, and utility models from 1988-2000, including Chevrolet C1500, K1500, Tahoe, and GMC C2500, K2500, and Yukon applications.

The Gates OE Type Thermostat line focuses on factory-style operation and consistent cooling-system performance. For drivers servicing a Chevrolet C1500 thermostat or a GMC K2500 thermostat, this part number 33889 matches the OE-style design and temperature rating used in many GM truck and SUV cooling systems.

Key Features

• OE Type Thermostat with OE Performance comparison rating
• 195-degree start-to-open temperature for factory-style engine warm-up control
• Bottom by-pass design for listed GM applications
• Stainless steel and copper construction for corrosion resistance
• Jiggle pin weep hole included for air bleeding during cooling-system service
• OEM-equivalent fit and sealing profile for select Chevrolet and GMC vehicles
• Gates part number 33889 for easy catalog matching

Detailed Description

Gates 33889 thermostat is engineered to regulate coolant flow at the specified opening temperature so the engine reaches and maintains the intended operating range. The OE-style construction uses stainless steel and copper materials, a bottom by-pass layout, and a jiggle pin weep hole to support proper coolant circulation and air purge. With a sealing flange diameter around 2.51-2.52 inches and a height between flanges around 1.6 inches, this thermostat is built around the dimensions used in the listed GM cooling systems.

This part cross-references Stant 14039 and Motorad 332-195 for the same application.

What It Helps Address

• Engine running too cool or too warm due to thermostat wear
• Delayed warm-up after cold starts
• Temperature fluctuation from a sticking thermostat
• Coolant flow issues caused by an incorrect OE-style replacement
• Cooling-system service on Chevrolet and GMC 195-degree applications

Installation Notes and Tips

• Verify the thermostat orientation and bottom by-pass design before installation.
• Inspect the thermostat housing, sealing surfaces, and coolant condition during service.
• Use the listed 195-degree specification to match the original cooling strategy.
• Bleed trapped air from the system after installation using the jiggle pin weep hole as part of normal service procedure.
• Confirm vehicle fitment by year, make, model, and engine cooling configuration before ordering.

Quality Assurance

Gates OE Type Thermostats are built to deliver precise temperature control and an OEM-equivalent fit for the listed Chevrolet and GMC applications. Gates 33889 is an OE-style replacement for 1988-2000 GM trucks, vans, SUVs, and related models, including Chevrolet C1500, K1500, Tahoe, and GMC C2500, K2500, and Yukon fitments.