Four Seasons Engine Coolant Thermostat / Water Outlet Assembly P/N:85951

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$32.99
MPN: 85951
Item Package Quantity: 1
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Four Seasons Engine Coolant Thermostat / Water Outlet Assembly P/N:85951
Four Seasons Engine Coolant Thermostat / Water Outlet Assembly P/N:85951
$32.99

Keep coolant moving and engine temperature under control with the Four Seasons Engine Coolant Thermostat Housing / Water Outlet Assembly 85951. This bolt-on water outlet houses the thermostat that regulates coolant flow between the engine and radiator, and it installs as a direct-fit replacement on many vehicles, among them the 2019-2020 Nissan Frontier, 2001-2004 Nissan Pathfinder and 2019-2021 Nissan NV1500. See the Buyer's Guide tab for the full application list.

  • All-in-one repair: a complete bolt-on solution that pairs the water outlet with an included quality thermostat.
  • Corrosion protection: coated with a corrosion and rust inhibitor.
  • 100% leak tested for reliable sealing.
  • Direct-fit replacement designed for straightforward installation.

If a cracked, warped, or leaking factory housing — or a stuck thermostat — is the cause of your coolant leak or temperature swings, this assembly replaces both parts at once. Backed by Four Seasons and over 50 years of mobile A/C experience.

Interchange: 1601317692 · 6052015 · 815769 · 2120031U13 · 2120031U1B · 9025249 · 34041 · 8241589 · 391140 · 391180 · 60540081 · W98481 · 14668

This part cross-references / interchanges with the following part numbers:

1601317692, 6052015, 85951, 815769, 2120031U13, 2120031U1B, 9025249, 34041, 8241589, 391140, 391180, 60540081, W98481, 14668

Frequently Asked Questions

Does this assembly include a thermostat?

Yes. Four Seasons 85951 is an all-in-one water outlet assembly that comes with a quality thermostat, so you replace the housing and thermostat together in one bolt-on part.

What does the thermostat housing / water outlet do?

It houses the thermostat that regulates coolant flow between the engine and radiator, and provides the outlet port and sealing surface where a coolant hose connects.

Will this fit my vehicle?

It's a direct-fit replacement for applications such as the 2019-2020 Nissan Frontier, 2001-2004 Nissan Pathfinder, and 2019-2021 Nissan NV1500. Check the Buyer's Guide tab to confirm your exact year, make, and model.

Is it protected against corrosion?

Yes. The assembly is coated with a corrosion and rust inhibitor, and each unit is 100% leak tested before it ships.

What are signs this part may need replacing?

Coolant leaking around the housing, engine temperature that runs high or fluctuates, or a thermostat stuck open or closed may indicate the housing or thermostat should be replaced. Diagnose the cause first.