Gates 33951 Engine Coolant Thermostat

Integrated Thermostat Housing for OE Temperature Control

Gates 33951 is an integrated housing thermostat built for precise engine coolant temperature regulation. It supports OE-style operation for Nissan and INFINITI applications that use an integrated thermostat housing, including the Nissan Altima, Maxima, Murano, Quest, and INFINITI I35.

The Gates Integrated Housing Thermostat line focuses on aftermarket replacement solutions for vehicles that combine the thermostat and housing into one assembly. Part number 33951 follows that approach with OE performance expectations and the correct 180 degree / 82 C opening temperature for listed applications.

Key Features

• Integrated housing thermostat design
• Start to open temperature: 180°F / 82°C
• OE performance comparison rating
• Jiggle pin weep hole: yes
• Jiggle pin/check valve: yes
• 3 bolt holes for mounting
• Electric: no
• Outlet inside diameter: 1.23 in and 0.44 in
• Outlet outside diameter: 1.45 in and 0.56 in

Detailed Description

Gates 33951 is an engine coolant thermostat for integrated housing systems where temperature control and housing fitment are combined in one service part. Gates develops this product line to address the growing number of vehicles that use integrated thermostat housings, giving technicians an OE-style replacement option for cooling system service. This part cross-references Motorad 431-180 for the same application.

Compatible With 2002-2006 Nissan Altima, 2002-2008 Nissan Maxima, 2003-2007 Nissan Murano, 2004-2009 Nissan Quest, and 2002-2004 INFINITI I35. The Gates 33951 thermostat is also referenced by interchange numbers including 21200-8J100 and 212008J10B for select applications.

What It Helps Address

• Engine running too cool or too warm
• Delayed coolant temperature regulation after startup
• Cooling system service on integrated thermostat housing designs
• Temperature control concerns on Nissan Altima, Maxima, Murano, Quest, and INFINITI I35 applications
• Replacement needs for OE-style thermostat housing assemblies

Installation Notes and Tips

Verify the outlet diameters, bolt-hole count, and opening temperature before installation. Confirm the vehicle application against the listed fitment for the Nissan Altima, Maxima, Murano, Quest, or INFINITI I35, and inspect the cooling system for contamination or damaged sealing surfaces before reassembly. Because this is an integrated housing thermostat, match the housing style to the original part configuration.

Quality Assurance

Gates positions the Integrated Housing Thermostat line as an OE-performance aftermarket solution for modern cooling systems that use integrated thermostat housings. Part number 33951 is built to support accurate temperature regulation in the listed applications.