S197Seller listing
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View listing at Fordpartsgiant; opens in a new tabS197 Mustang · Buyer's guide
2005-2010 Mustang V6 4.0L Thermostat Housing, Thermostat, Water Pump and Leak Paths
2005-2010 Mustang V6 4.0L only; 4.6L/5.4L and 2011-up engines excluded
Current seller options
WHERE TO BUY
Open an exact listing, then confirm fitment, stock, price, and shipping with the seller before ordering.
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S197Seller listing
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View listing at AmericanMuscle; opens in a new tabS197Seller listing
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View listing at Oemfordpart; opens in a new tabS197Seller listing
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What you need to know
2005-2010 4.0L V6 only. Pressure-test and separate housing seam, thermostat/seal, sensor/connector, hose, pump, radiator and fan faults. Confirm listing contents before disassembly.
OEM numbers
Thermostat housing 5R3Z-8592-BAMotorcraft RH-158thermostat 2L2Z-8575-AAMotorcraft RT-1168gasket 1L2Z-8255-AAwater pump AR3Z-8501-A.Supersession
No 4.6L/5.4L or 2011-up cooling interchange asserted. Housing-only, thermostat-only and complete-assembly listings must be read literally.
Fitment
2005-2010 4.0L V6 only. Pressure-test and separate housing seam, thermostat/seal, sensor/connector, hose, pump, radiator and fan faults. Confirm listing contents before disassembly.
Aftermarket options
Checked OEM/Motorcraft and replacement housing/thermostat paths. Some housings omit thermostat, sensors or seals.
Before you buy
4.0L V6 only. Pressure-test before ordering and confirm whether a housing listing includes the thermostat, seals or sensors. 4.6L, 5.4L and 2011-up cooling parts are excluded. Ship-time/cart language is not guaranteed inventory.
Research and fitment sources
Supersede reviewed 10 unique research sources for this guide. 5 also appear above as a seller or official action and are not repeated here; 5 additional citations follow.
Research last verified .