Four Seasons 86221 Engine Coolant Water Outlet

Engine Coolant Water Outlet for GM HD Trucks

Four Seasons Water Outlet 86221 is an aluminum engine coolant outlet for the thermostat and housing system. It is built to meet or exceed OEM requirements and is listed for 2011-2016 Chevrolet Silverado 2500 HD, 2011-2016 Chevrolet Silverado 3500 HD, 2011-2016 GMC Sierra 2500 HD, and 2011-2016 GMC Sierra 3500 HD applications.

The Four Seasons Water Outlet line focuses on direct-fit cooling system service parts for GM truck cooling repairs. Part number 86221 is an outlet-style component without a thermostat, making it a straightforward replacement when servicing the coolant passage at the housing connection.

Key Features

• Aluminum construction for cooling system durability
• Outlet-style engine coolant water outlet, w/o thermostat
• Meets or exceeds OEM specifications
• Inlet diameter: 1.82 in.
• Maximum height: 7.50 in.
• Mounting hole quantity: 4
• Bolt hole center to bolt hole center: 1.87 in.
• Mounting flange width: 0.815 in.
• Gasket or seal not included
• Bleeder screw not included

Detailed Description

Four Seasons 86221 is an engine coolant water outlet designed for the thermostat and housing area on select GM heavy-duty trucks. The aluminum body supports reliable coolant routing, while the outlet configuration without a thermostat keeps the part focused on the housing connection itself. This part cross-references GM OE-style numbers such as 12642717 and 12645998 for the same application.

Compatible With 2011-2016 Chevrolet Silverado 2500 HD, 2011-2016 Chevrolet Silverado 3500 HD, 2011-2016 GMC Sierra 2500 HD, and 2011-2016 GMC Sierra 3500 HD. Use part number 86221 when matching the coolant outlet by vehicle application and housing dimensions.

Common Repair Uses

• Replacing a cracked or corroded coolant outlet
• Restoring proper coolant flow at the thermostat housing connection
• Addressing coolant seepage at the outlet mounting surface
• Repairing a damaged aluminum outlet on GM HD truck cooling systems
• Servicing a leaking water outlet during cooling system maintenance

Installation Notes

Confirm the inlet diameter, mounting hole pattern, and flange dimensions before installation. Because the gasket or seal is not included, transfer or replace the sealing component as required for the repair. Verify that the thermostat is not needed for your application, since this outlet is supplied without one.

Quality Assurance

Four Seasons 86221 is built to meet or exceed OEM requirements for the listed GM truck applications. Verify fitment against the vehicle year, make, model, and cooling system configuration before installation.