Gates 33038S Engine Coolant Thermostat

Gates Premium Thermostat 33038S Overview

The Gates Premium Thermostat 33038S is an engine coolant thermostat built for stable temperature control in classic Chrysler, Dodge, Ford, Lincoln, Mercury, Buick, Cadillac, and Jeep applications. Its stainless steel and copper construction helps resist corrosion, while the upgraded spring supports consistent opening performance during normal operation.

Gates Premium Thermostat 33038S is a direct-fit style replacement for many vintage V8 cooling systems, including Chrysler Newport, Dodge Charger, and Ford F-100 applications that call for a 180-degree thermostat.

Key Features

• Heavy-gauge stainless steel and copper construction
• Reverse poppet design for the listed applications
• 180-degree start-to-open temperature
• Upgraded spring for improved temperature stability
• Sealing flange outside diameter: 2.5 in.
• Height between flanges: 0.91 in.; overall height: 1.7 in.
• No jiggle pin weep hole, no gasket, and no installation tool included

Product Details

As part of the Gates Premium Thermostat line, this thermostat is engineered for dependable coolant flow control in older domestic vehicles where maintaining a steady operating temperature matters for drivability and engine protection. The 33038S uses a reverse poppet layout and a 180-degree opening point, making it a strong match for many OE-temperature and alternate-temperature cooling system setups. This part cross-references Monroe Shocks & Struts (e.g., 65478) for the same application.

Compatible With 1946-1978 Cadillac, Buick, Chrysler, Dodge, Ford, Jeep, Lincoln, and Mercury models across the listed fitments, including Chrysler 300, Dodge Dart, Ford Thunderbird, and Lincoln Continental applications. The Gates 33038S is also listed for many truck and wagon platforms such as Ford F-100, F-250, F-350, and Jeep Wagoneer.

Common Cooling Issues It Addresses

• Engine running too cool or taking too long to reach operating temperature
• Temperature swings caused by a worn thermostat spring
• Corrosion-related thermostat sticking in older cooling systems
• Inconsistent coolant circulation in 180-degree thermostat applications
• Replacement needs for classic vehicle restoration or maintenance

Installation Notes and Tips

Verify the thermostat housing dimensions, flange diameter, and opening temperature before installation. Clean the housing mating surfaces thoroughly and inspect the cooling system for scale, corrosion, or restricted flow before installing the new thermostat. Because no gasket is included, use the correct gasket or seal specified for the vehicle application. Bleed air from the cooling system after service and confirm normal operating temperature during a road test.

Quality Assurance

Gates builds this Premium Thermostat with corrosion-resistant metal construction and an upgraded spring to support stable operation under normal driving conditions. The 33038S is a quality replacement choice for classic Chrysler, Dodge, Ford, Lincoln, Mercury, Buick, Cadillac, and Jeep cooling systems.