Gates 33019S Engine Coolant Thermostat

Gates Premium Thermostat 33019S Overview

The Gates Premium Thermostat 33019S is an engine coolant thermostat built for stable temperature control in a wide range of GM trucks, vans, and SUVs. It uses stainless steel and copper construction with an O-ring seal to support corrosion resistance and consistent sealing in everyday cooling system service.

Gates Premium Thermostat line focuses on upgraded internal components for steadier operation under normal driving conditions. For shoppers searching for a 195 degree thermostat for Chevrolet Silverado 1500, GMC Sierra 1500, or Chevrolet Express 2500 applications, part number 33019S is a direct-fit cooling system service part.

Key Features

• Engine coolant thermostat with a 195 degree start-to-open temperature
• Heavy-gauge stainless steel and copper construction for corrosion resistance
• Bottom by-pass design for listed GM applications
• O-ring seal type for a secure coolant seal
• Upgraded spring for temperature stability during normal operation
• Seal included; no gasket quantity listed
• Fits a broad range of Chevrolet, GMC, Cadillac, Oldsmobile, Isuzu, and GMC truck and SUV applications

Detailed Description

Gates 33019S is engineered as a premium thermostat for cooling system maintenance where accurate temperature regulation matters. The stainless steel body and copper components help resist corrosion, while the spring design supports consistent opening behavior as coolant temperature rises. With a 195 degree opening point, this thermostat matches many OE-style cooling system requirements across GM light trucks, vans, and utility vehicles.

Fits 1996-2014 Chevrolet Express 1500, N/A; Fits 1999-2013 Chevrolet Silverado 1500, N/A; Fits 1999-2013 GMC Sierra 1500, N/A; Fits 1996-2005 Chevrolet Blazer, N/A; Fits 1996-2000 GMC Yukon, N/A. This part cross-references Monroe Shocks & Struts (e.g., 34909) for the same application.

Common Cooling System Issues It Can Address

• Engine running cooler or warmer than expected
• Delayed coolant flow regulation after startup
• Temperature fluctuation during normal driving
• Thermostat replacement during cooling system service
• Corrosion-related wear in the thermostat assembly

Installation Notes and Tips

Verify the 195 degree specification and bottom by-pass design against the original thermostat before installation. Inspect the sealing surface, replace degraded coolant as needed, and confirm the O-ring seats evenly in the housing. This thermostat does not include an installation tool.

For fitment-based searches, this thermostat is commonly selected for Chevrolet Silverado 1500 thermostat replacement, GMC Sierra 1500 cooling system service, and Chevrolet Express 2500 thermostat repair. Part number 33019S is also used across multiple GM truck and SUV platforms listed in the fitment data.

Quality Assurance

Gates Premium Thermostat components use upgraded materials and spring construction to support stable temperature control under normal operating conditions. The stainless steel and copper build is selected to improve corrosion resistance in cooling system environments.