Gates 33199S Engine Coolant Thermostat

Gates Premium Thermostat 33199S Overview

The Gates Premium Thermostat 33199S is an engine coolant thermostat built for stable temperature control in older Ford, Mazda, and Toyota applications. It uses stainless steel and copper construction for improved corrosion resistance, along with an upgraded spring to help maintain consistent opening behavior during normal operation.

Compatible With 195-degree OE-temperature cooling systems, this thermostat is a direct-fit service part for vehicles such as the Ford Explorer, Ford Ranger, Mazda B4000, and Ford Aerostar. The reverse poppet design supports precise coolant flow control in applications that call for factory-style thermal regulation.

Key Features

• Premium thermostat design for engine coolant temperature regulation
• Stainless steel and copper construction for corrosion resistance
• Upgraded spring for improved temperature stability under normal operation
• 195 degree start-to-open temperature for OE-style cooling performance
• Reverse poppet design
• No jiggle pin weep hole
• No installation tool included

Product Details

Gates Premium Thermostat 33199S is engineered for vehicles that require a 195-degree thermostat and factory-style coolant control. The heavy-gauge metal construction helps resist wear in cooling system service, while the spring calibration supports repeatable opening characteristics. This part cross-references FEL-PRO 61069 and Four Seasons 65369 for the same application.

Fits 1991-2000 Ford Explorer, N/A. Fits 1986-2000 Ford Ranger, N/A. Fits 1994-2000 Mazda B4000, N/A. Fits 1990-1997 Ford Aerostar, N/A. Fits 1991-1994 Mazda Navajo, N/A. Fits 1986-1990 Ford Bronco II, N/A. Fits 1972-1981 Ford Courier, N/A. Fits 1971 Toyota Corona, N/A. Fits 1970 Toyota Pickup, N/A.

Common Cooling System Issues

• Engine running too cool or too warm due to thermostat wear
• Delayed coolant flow control during warm-up
• Temperature fluctuation under normal driving conditions
• Corrosion-related thermostat deterioration in the cooling system
• OE thermostat replacement needs for service maintenance

Installation Notes and Tips

Verify the required opening temperature and housing dimensions before installation. This thermostat has a sealing flange outside diameter of 2.05 inches and a height between flanges of 0.87 inches, with a height from flange of 0.83 inches. Confirm the cooling system is clean, inspect the thermostat housing and gasket surfaces, and replace any worn coolant components during service.

Quality Assurance

Gates uses stainless steel construction and an upgraded spring in this Premium Thermostat line to support corrosion resistance and stable temperature control. The 33199S is built as a premium replacement for OE-temperature cooling system service in Ford, Mazda, and Toyota applications.