Gates 33943S Engine Coolant Thermostat

Gates Premium Thermostat 33943S Overview

The Gates Premium Thermostat 33943S is an engine coolant thermostat built for direct-fit cooling system service on a wide range of GM and Saab applications. It uses stainless steel and copper construction with a reverse poppet design and an O-ring seal for consistent coolant flow control at the OE opening temperature.

Gates Premium Thermostat line components are built with heavier-gauge stainless steel and an upgraded spring to improve corrosion resistance and temperature stability during normal operation. This makes the 33943S a practical choice for drivers servicing a Buick Regal, Chevrolet Malibu, or Saturn Vue cooling system.

Key Features

• Engine coolant thermostat with 180-degree start-to-open temperature
• Stainless steel and copper construction for corrosion resistance
• Reverse poppet design for OE-style coolant regulation
• O-ring seal type for a secure housing interface
• Premium thermostat design for stable temperature control
• Direct replacement for multiple Buick, Chevrolet, GMC, Pontiac, Saturn, and Saab applications

Detailed Description

Part number 33943S is an engine coolant thermostat designed to regulate coolant flow as the engine reaches operating temperature. By opening at 180 degrees, it supports proper warm-up and helps maintain the cooling balance expected in OE-style systems. The stainless steel and copper materials, along with the upgraded spring, are selected to improve durability and temperature consistency in everyday driving.

This thermostat is a fitment match for vehicles such as the 2015-2017 Buick Regal, 2012-2017 Buick Verano, 2010-2017 GMC Terrain, 2004-2012 Chevrolet Malibu, and 2002-2009 Saturn Vue. It also cross-references Gates 33943 for the same application.

Common Cooling System Issues

• Engine running too cool or taking too long to reach operating temperature
• Temperature fluctuation during normal driving
• Thermostat sticking open or closed
• Cooling system service on Buick Regal, Chevrolet Equinox, or Saturn Vue applications
• Replacement of a worn OE thermostat with a reverse poppet design

Installation Notes

Verify the thermostat housing, seal surface, and coolant condition before installation. This part uses an O-ring seal and does not include an installation tool. Confirm the 180-degree opening specification and match the vehicle application exactly, especially on Buick Regal, Chevrolet Malibu, and GMC Terrain models.

Quality Assurance

Gates Premium Thermostats are built with heavy-gauge stainless steel construction and an upgraded spring to support corrosion resistance and stable operating temperature under normal conditions. The 33943S is engineered as a premium replacement thermostat for OE-style cooling system service.