Gates 34045 Engine Coolant Thermostat

Gates Integrated Housing Thermostat 34045

The Gates 34045 integrated housing thermostat is built for precise coolant temperature control in vehicles that use an integrated thermostat housing design. It supports stable engine operating temperature and is a direct-fit style replacement for select Chevrolet Colorado, GMC Canyon, Hummer H3, Hummer H3T, and Isuzu i-290/i-370 applications.

Key Features

• Integrated housing thermostat design for OE-style cooling system service
• Start-to-open temperature: 187°F / 86°C
• Outlet inside diameter: 1.261 in.
• Outlet outside diameter: 1.564 in.
• 2 bolt holes for housing mounting
• Jiggle pin weep hole and jiggle pin/check valve: yes
• 1 seal included in the assembly design
• OE performance rating

Product Details

Gates Integrated Housing Thermostat 34045 is part of the Gates thermostat housing line, which focuses on integrated cooling-system service parts for modern engines. As more vehicles use thermostat and housing assemblies together, this product line provides an aftermarket replacement built around accurate temperature regulation and consistent coolant flow control. This part cross-references Motorad 440-180 and 538-187 for the same application.

Use Gates 34045 when servicing cooling systems on 2004-2012 Chevrolet Colorado and 2004-2012 GMC Canyon models, along with 2006-2010 Hummer H3 and 2009-2010 Hummer H3T applications. It also covers 2006 Isuzu i-280 and i-350, plus 2007-2008 Isuzu i-290 and i-370. The part number 34045 is commonly searched for OE-style thermostat housing replacement on these platforms.

What It Helps Address

• Engine running too cool or too hot due to thermostat control issues
• Temperature fluctuation from a worn thermostat housing assembly
• Coolant flow problems related to a sticking thermostat
• Service needs on integrated housing cooling system designs
• Fitment-specific replacement needs for Chevrolet Colorado and GMC Canyon cooling systems

Installation Notes

Verify outlet diameter, bolt-hole count, and temperature specification before installation. This thermostat uses an integrated housing layout with 2 bolt holes and a jiggle pin weep hole, so matching the original housing style is important for proper fitment. Confirm vehicle application by year, make, and model before service on Chevrolet Colorado, GMC Canyon, Hummer H3, Hummer H3T, and Isuzu i-290/i-370 platforms.

Quality Assurance

Gates develops aftermarket thermostat solutions for integrated housing applications with OE performance positioning and temperature-control focus. The 34045 is engineered as a replacement option for vehicles that require an integrated thermostat housing assembly.

• Fits 2004-2012 Chevrolet Colorado, N/A
• Fits 2004-2012 GMC Canyon, N/A
• Fits 2006-2010 Hummer H3, N/A
• Fits 2009-2010 Hummer H3T, N/A
• Fits 2007-2008 Isuzu i-290, N/A
• Fits 2007-2008 Isuzu i-370, N/A
• Fits 2006 Isuzu i-280, N/A
• Fits 2006 Isuzu i-350, N/A