Polaris Snowmobiles Thermostat Direct Fit For Liquid Cooled Engines 2001 To 2019

This thermostat is a direct-fit cooling-system component designed for liquid-cooled snowmobiles built between 2001 and 2019. It regulates engine temperature to prevent overheating and to promote reliable warm-up, ensuring consistent performance across long trail runs or farm-duty work. Built for a wide range of Polaris models, it restores the predictable cooling behavior that lightweight, high-load engines demand in cold and hot conditions alike.

This aftermarket replacement emphasizes durability and steady operation under demanding conditions. It uses premium materials and a precise opening temperature to reduce fan cycling and thermostat leaks, delivering dependable regulation across seasons and terrain. Choosing this aftermarket thermostat provides a cost-effective, dependable option for keeping cooling system efficiency intact on rugged trails and workdays alike.

Comprehensive Vehicle Fitment

Product Specifications

OEM & Aftermarket Cross-Reference Information

What's Included

This kit includes the essential thermostat assembly ready for installation.

• Thermostat assembly

Related components such as hoses, clamps, or auxiliary seals are not included unless specified for a particular model.

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility—engineered to install like the OEM part on a broad range of Polaris liquid-cooled snowmobiles (2001-2019).
• OEM Cross-Reference—aligns with aftermarket cross-reference practices (e.g., RMSTATOR RMS150-105809) to simplify sourcing.
• Premium Materials—constructed with durable materials to withstand the thermal cycling and vibration of rugged trail use.
• Performance Restoration—restores predictable opening temperature and stable coolant flow, reducing overheating risk.
• Cost-Effective Alternative—provides reliable replacement at a lower cost than dealer-sourced units while maintaining function.
• Trail- and Farm-Ready Durability—designed to stand up to extended operation in demanding environments and weather conditions.

Installation Notes:

• Drain coolant before removal to prevent spills and mixing; recheck coolant type and ratio after installation.
• Ensure the thermostat is oriented correctly with the flow direction; improper orientation can cause restricted flow or overheating.
• Inspect mating surfaces for corrosion or residue; clean with appropriate cleaner and reseal if needed.
• Use new gaskets or o-rings if supplied; confirm seal integrity before starting the engine.
• Refill and bleed the cooling system to remove air pockets; verify no leaks after a test run.
• Follow torque recommendations for any fasteners involved in the installation (if applicable to model).

Why Upgrade?

Running a worn-out thermostat in a high-load snowmobile cooling system can lead to unpredictable overheating, which accelerates cylinder wear and can cause coolant boil-overs. Replacing with an aftermarket thermostat that matches OEM specifications restores reliable temperature control, protects the engine, and ensures consistent performance on demanding trails and workdays.