Gates 33576 Engine Coolant Thermostat

Gates 33576 Heavy-Duty Thermostat Overview

The Gates 33576 Heavy-Duty Thermostat is an engine coolant thermostat built for demanding under-hood conditions. It uses a Weir-Stat design with stainless steel, steel, and copper construction to help maintain stable coolant control in heavy-duty truck, bus, tractor, and equipment applications.

Compatible With select BMW M5 and M6 models, plus Dodge Ram 1500, Ram 2500, Ram 3500, and Ford GT applications that call for a 160-degree thermostat. The Gates 33576 is also cross-referenced to Four Seasons 33576 for the same application.

Key Features

• Heavy-Duty Thermostat design for high-vibration, high-load environments
• Weir-Stat construction for controlled coolant flow response
• 160 degree start-to-open temperature
• Stainless steel, steel, and copper materials
• 2.27 in valve diameter and 2.87 in sealing flange outside diameter
• No jiggle pin weep hole, no installation tool included
• Fits applications that specify an alternate-temperature thermostat

Detailed Description

Gates Heavy-Duty Thermostat 33576 is engineered for vehicles and equipment that operate under sustained thermal and mechanical stress. The Weir-Stat design and metal construction support consistent coolant regulation, while the 160 degree opening point matches applications that require a lower operating temperature than standard thermostats. This part number is used across select BMW M5 and M6 models, Dodge Ram 1500, Ram 2500, Ram 3500, and Ford GT fitments listed for alternate-temperature service.

This thermostat measures 3.16 in overall height, with 1.25 in height between flanges and .21 in flange thickness. It is built without a gasket, seal, or jiggle pin weep hole, so the correct sealing components and housing condition should be verified during service. Part number 33576 is also listed under multiple aftermarket references, including Stant 14536.

Common Problems This Part Can Address

• Engine running hotter than expected
• Temperature fluctuation during load or idle changes
• Delayed coolant flow regulation after warm-up
• Thermostat sticking open or closed
• Cooling system service on vehicles calling for a 160 degree thermostat

Installation Notes and Tips

Confirm the thermostat housing, sealing surface, and coolant specification before installation. Because this Gates 33576 thermostat does not include a gasket or seal, match the required sealing components to the vehicle application. Verify the opening temperature and dimensions against the original part before assembly, especially on BMW M5, BMW M6, Dodge Ram 1500, Dodge Ram 2500, Dodge Ram 3500, and Ford GT applications.

Quality Assurance

Gates positions its Heavy-Duty Thermostat line for harsh-duty service where noise, vibration, and heat cycling are common. The 33576 follows that product-line focus with durable metal construction and application-specific temperature control for listed fitments.