Keep engine temperature in check and coolant flowing where it belongs with the Four Seasons Engine Coolant Thermostat / Water Outlet Assembly (P/N 86343). It installs as a direct-fit replacement for the 2017-2019 Buick LaCrosse, 2019-2020 Buick Regal Sportback, 2017-2023 Cadillac XT5, 2020-2023 Cadillac XT6, 2019-2025 Chevrolet Blazer, and 2017-2023 GMC Acadia.
This assembly combines the coolant thermostat and its water outlet housing in one serviceable unit:
- Temperature regulation: the thermostat opens and closes with coolant temperature to help the engine reach and hold its normal operating range.
- Integrated water outlet: houses the thermostat and routes coolant toward the radiator hose connection.
- Complete assembly: replaces the thermostat and housing together, simplifying the job over sourcing separate pieces.
If a stuck or failed thermostat is behind overheating, slow warm-up, or coolant seepage at the housing, this assembly replaces the original unit. Consult the vehicle service information for the correct coolant fill and any fasteners, including whether they may be reused.
Interchange: 9022115 · 12670557 · 12673659 · 12678779 · 860221
Manufacturer part number 86343
This part cross-references / interchanges with the following part numbers:
86343, 9022115, 12670557, 12673659, 12678779, 860203, 860221
