Gates 33578 Engine Coolant Thermostat

Gates 33578 Heavy-Duty Thermostat Overview

The Gates 33578 engine coolant thermostat is a heavy-duty cooling system component built for demanding underhood conditions. It uses a Weir-Stat design with stainless steel, steel, and copper construction for service in truck, bus, tractor, and heavy equipment cooling systems, and it opens at 180 degrees for temperature control in the specified applications.

Compatible With BMW M5 and BMW M6 applications, as well as Dodge Ram 1500, Ram 2500, Ram 3500, and Ford GT fitments listed below, this thermostat is a direct-fit cooling service part for vehicles that require the 180-degree specification. The Gates 33578 is also cross-referenced to Stant 14538 for the same application.

Key Features

• Heavy-duty engine coolant thermostat for cooling system service
• Weir-Stat design for controlled coolant flow regulation
• 180 degree start-to-open temperature
• Stainless steel, steel, and copper construction
• 2.27 in valve diameter and 2.87 in sealing flange outside diameter
• 3.16 in overall height with 1.3 in height between flanges
• No jiggle pin weep hole, no gasket, and no installation tool included

Detailed Description

Gates Heavy-Duty Thermostat part number 33578 is engineered for cooling systems that need stable temperature regulation under demanding operating conditions. The Green Stripe heavy-duty thermostat line is built for applications exposed to vibration, noise, and harsh underhood environments, making it a practical choice for diesel and performance-oriented cooling service where the specified opening temperature matters. The 180-degree calibration supports the listed BMW M5, BMW M6, Dodge Ram, and Ford GT applications that call for this thermostat specification.

With a Weir-Stat design and corrosion-resistant metal construction, the Gates 33578 helps maintain proper coolant circulation once the engine reaches operating temperature. Its dimensions and flange profile are important for correct housing fitment, and the part number 33578 should be matched to the vehicle’s cooling system requirements before installation.

What It Helps Address

• Engine running hotter than normal due to a worn thermostat
• Slow warm-up or unstable coolant temperature control
• Cooling system service on heavy-duty or high-load vehicles
• Temperature-spec mismatch during thermostat replacement
• Fitment issues when replacing the original 180-degree thermostat

Installation Notes and Tips

Verify the thermostat housing dimensions, opening temperature, and application notes before installation. Clean the sealing surfaces thoroughly and inspect the housing for corrosion or warpage. Because no gasket is listed with this part, confirm the correct sealing method for the vehicle application and use the proper coolant refill and bleed procedure after service.

• Fits 2006-2008 BMW M5, N/A; 180 Degree; Alternate Temperature; Seal included; Heavy-Duty Thermostat
• Fits 2006-2008 BMW M6, N/A; 180 Degree; Alternate Temperature; Seal included; Heavy-Duty Thermostat
• Fits 2004-2006 Dodge Ram 1500, N/A; 180 Degree; Alternate Temperature; Seal included; Heavy-Duty Thermostat
• Fits 2006 Ford GT, N/A; 180 Degree; OE Temperature; Seal included; Heavy-Duty Thermostat
• Fits 1994-2003 Dodge Ram 2500, N/A; 180 Degree; Alternate Temperature; Seal included; Heavy-Duty Thermostat
• Fits 1994-2003 Dodge Ram 3500, N/A; 180 Degree; Alternate Temperature; Seal included; Heavy-Duty Thermostat

Quality Assurance

Gates designs the Green Stripe Heavy-Duty Thermostat line for demanding commercial and performance cooling applications. Part number 33578 is built to meet the temperature and dimensional requirements called out for the listed fitments, including BMW M5, BMW M6, Dodge Ram, and Ford GT applications.