How to service the thermostat housing on a 4.0L SOHC engine on Mercury Mountaineer?

To access the thermostat housing of a 4.0L SOHC engine, drain the cooling system, disconnect upper radiator hose, ECT sensor and heater hose. Take out thermostat housing bolts, examine the O-ring seal and change where necessary. Installation can be reversed and bolts tightened to 12 Nm (9 ft. lbs. ).

How to service and repair the thermostat housing on Mercury Cougar?

In order to repair the thermostat housing, deplete the cooling system, disconnect the coolant hoses, engine coolant temperature sensor, and gauge sender. Unscrew the bolts and remove the thermostat housing and dispose of the O-ring seal. In order to install it, reverse the instructions and restore the cooling system.

OEM Mercury Thermostat Housing

Engine Coolant Thermostat Housing

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34 Thermostat Housings found

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Mercury Thermostat Housing, Lower Part Number: GL2Z-8592-A
$43.17 MSRP: $62.83
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Product Specifications
- Other Name: Connection Water Outlet; Engine Coolant Thermostat Housing, Lower; Thermostat Housing Cover; Lower Housing
- Position: Lower
- Replaces: 1L2Z-8592-BB, RH-148, RH-93
Fits the following Mercury Models:
- Mountaineer | 2001-2010 | Base, Convenience, Luxury, Premier | 6 Cyl 4.0 L FLEX, 6 Cyl 4.0 L GAS, 8 Cyl 4.6 L GAS
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Mercury Thermostat Housing, Upper Part Number: F5RZ-8K528-CC
$91.98 MSRP: $133.88
You Save: $41.90 (32%)
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Product Specifications
- Other Name: Connection - Water Inlet; Engine Coolant Thermostat Housing, Upper; Thermostat Housing Cover; Connector Tube; Housing
- Position: Upper
- Replaces: F5RZ-8K528-B
Fits the following Mercury Models:
- Cougar | 1999-2002 | Base, S, V6 | 6 Cyl 2.5 L GAS
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Mercury Thermostat Housing, Lower Part Number: 2L5Z-8592-BB
$51.07 MSRP: $74.33
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Product Specifications
- Other Name: Connection Water Outlet; Engine Coolant Thermostat Housing, Lower; Engine Coolant Water Outlet; Thermostat Housing Cover; Connection - Water Outlet; Water Outlet
- Manufacturer Note: Housing For 2 Clip In Style Sensors
- Position: Lower
Fits the following Mercury Models:
- Mountaineer | 2001 | Base | 6 Cyl 4.0 L GAS
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Mercury Thermostat Housing Part Number: FOTZ-8592-F
$38.42 MSRP: $53.14
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Product Specifications
- Other Name: Connection - Water Outlet; Thermostat Housing Cover
- Manufacturer Note: Connector , Gas
Fits the following Mercury Models:
- Colony Park | 1987-1991 | GS, LS | 8 Cyl 5.0 L GAS
- Grand Marquis | 1984-1991 | Base, Colony Park, GS, LS | 8 Cyl 5.0 L GAS, 8 Cyl 5.8 L GAS
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Mercury Water Outlet Part Number: 9L8Z-8592-A
$23.99 MSRP: $32.64
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Product Specifications
- Other Name: Connection Water Outlet; Engine Coolant Inlet Flange; Engine Coolant Water Outlet; Connector; Connection - Water Outlet
Fits the following Mercury Models:
- Mariner | 2009-2011 | Base, Premier | 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS
- Milan | 2010-2011 | Premier | 6 Cyl 3.0 L FLEX
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Mercury Thermostat Housing Part Number: F1VY-8592-AA
$5.62 MSRP: $7.77
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Product Specifications
- Other Name: Connection - Water Outlet; Thermostat Housing Cover; Outlet Assembly
- Manufacturer Note: Connector , NGV, BEFORE 12/10/98
Fits the following Mercury Models:
- Grand Marquis | 1992-1995 | GS, LS | 8 Cyl 4.6 L GAS
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Mercury Thermostat Housing Part Number: 7T4Z-8A586-B
$830.63 MSRP: $1149.10
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Product Specifications
- Other Name: Connection Water Outlet; Thermostat Housing Cover; Housing Assembly; Connection - Water Outlet
- Replaces: 7T4Z-8A586-A
Fits the following Mercury Models:
- Sable | 2008-2009 | Base, Premier | 6 Cyl 3.5 L GAS
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Mercury Drain Hose Connector, Rear Part Number: 8L8Z-8592-B
$13.78 MSRP: $18.75
You Save: $4.97 (27%)
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Product Specifications
- Other Name: Connection Water Outlet; Sunroof Drain Hose Adapter, Rear
- Position: Rear
- Replaces: RH-182, 8L8Z-8592-A
Fits the following Mercury Models:
- Mariner | 2008-2011 | Base, Hybrid, Premier | 4 Cyl 2.3 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.5 L GAS, 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS
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Mercury Thermostat Housing Part Number: F8RZ-8592-AG
Product Specifications
- Other Name: Housing - Thermostat; Thermostat Housing Cover
Fits the following Mercury Models:
- Cougar | 1999-2002 | Base | 4 Cyl 2.0 L GAS
- Mystique | 1999-2000 | GS | 4 Cyl 2.0 L GAS
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Mercury Thermostat Housing, Upper Part Number: 7R3Z-8592-A
$25.85 MSRP: $36.67
You Save: $10.82 (30%)
Product Specifications
- Other Name: Connection Water Outlet; Engine Coolant Thermostat Housing, Upper; Engine Coolant Water Outlet; Thermostat Housing Cover; Water Outlet; Thermostat Outlet; Upper Housing; Connection - Water Outlet
- Position: Upper
- Replaces: 6L2Z-8592-DA
Fits the following Mercury Models:
- Mountaineer | 2005-2010 | Convenience, Luxury, Premier | 8 Cyl 4.6 L GAS
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Mercury Thermostat Housing Part Number: F5TZ-8592-CA
Product Specifications
- Other Name: Connection - Water Outlet; Thermostat Housing Cover
Fits the following Mercury Models:
- Mountaineer | 1997-1998 | Base | 8 Cyl 5.0 L GAS
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Mercury Thermostat Housing Part Number: F6AZ-8592-AB
Product Specifications
- Other Name: Connection Water Outlet; Thermostat Housing Cover; Outlet Assembly; Connection - Water Outlet
- Manufacturer Note: CONNECTOR
Fits the following Mercury Models:
- Grand Marquis | 1996-2000 | GS, LS | 8 Cyl 4.6 L GAS
- Mountaineer | 2002-2005 | Base, Convenience, Luxury, Premier | 8 Cyl 4.6 L GAS
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Mercury Thermostat Housing Part Number: XF2Z-8592-AB
Product Specifications
- Other Name: Connection - Water Outlet; Thermostat Housing Cover
Fits the following Mercury Models:
- Sable | 1992-1995 | GS, LS, LTS | 6 Cyl 3.0 L GAS
- Topaz | 1992-1994 | GS, LTS, Sport, XR5 | 6 Cyl 3.0 L GAS
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Mercury Thermostat Housing Part Number: F6DZ-8592-AA
Product Specifications
- Other Name: Connection - Water Outlet; Engine Coolant Thermostat Housing; Thermostat Housing Cover
Fits the following Mercury Models:
- Sable | 1996-2000 | G, GS, LS, LS Premium | 6 Cyl 3.0 L GAS
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Mercury Thermostat Housing Part Number: F23Z8592AA
Product Specifications
- Other Name: Connection Water Outlet; Thermostat Housing Cover
Fits the following Mercury Models:
- Topaz | 1992-1994 | GS, LS, LTS, Sport | 4 Cyl 2.3 L GAS
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Mercury Thermostat Housing Part Number: F4SZ-8592-A
Product Specifications
- Other Name: Connection Water Outlet; Engine Coolant Thermostat Housing; Engine Coolant Water Outlet; Thermostat Housing Cover; Outlet Assembly; Connection - Water Outlet; Water Outlet
Fits the following Mercury Models:
- Cougar | 1994-1995 | XR-7 | 8 Cyl 4.6 L GAS
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Mercury Thermostat Housing Part Number: F4XZ-8592-BA
Product Specifications
- Other Name: Connection - Water Outlet; Thermostat Housing Cover
Fits the following Mercury Models:
- Villager | 1993-2002 | Base, Estate, GS, LS, Nautica, Sport | 6 Cyl 3.0 L GAS, 6 Cyl 3.3 L GAS
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Mercury Thermostat Housing Part Number: F6ZZ-8592-C
Product Specifications
- Other Name: Connection - Water Outlet; Engine Coolant Thermostat Housing Cover; Thermostat Housing Cover; Outlet Assembly; Water Outlet
Fits the following Mercury Models:
- Cougar | 1996-1997 | XR-7 | 8 Cyl 4.6 L GAS
- Grand Marquis | 1999-2002 | GS, LS | 8 Cyl 4.6 L GAS
- Marauder | 2003-2004 | Base | 8 Cyl 4.6 L GAS
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Mercury Thermostat Housing Part Number: F78Z-8592-BD
Product Specifications
- Other Name: Connection Water Outlet; Engine Coolant Water Outlet; Thermostat Housing Cover; Water Outlet
Fits the following Mercury Models:
- Monterey | 2004-2007 | Base, Convenience, Luxury, Premier | 6 Cyl 4.2 L GAS
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Mercury Thermostat Housing Part Number: HS4Z-8A586-A
Product Specifications
- Other Name: Connection Water Outlet; Thermostat Housing Cover
- Replaces: F5RZ-8592-B, RH-43
Fits the following Mercury Models:
- Cougar | 1999 | Base | 4 Cyl 2.0 L GAS
- Mystique | 1995-1998 | Base, GS, GS Spree, LS | 4 Cyl 2.0 L GAS

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Mercury Thermostat Housing Parts and Q&A

Water Outlet, Upper
6L2Z-8592-FA
Q: How to service the thermostat housing on a 4.0L SOHC engine on Mercury Mountaineer?
A: To access the thermostat housing of a 4.0L SOHC engine, drain the cooling system, disconnect upper radiator hose, ECT sensor and heater hose. Take out thermostat housing bolts, examine the O-ring seal and change where necessary. Installation can be reversed and bolts tightened to 12 Nm (9 ft. lbs. ).
Thermostat Housing
F5RZ-8592-A
Q: How to service and repair the thermostat housing on Mercury Cougar?
A: In order to repair the thermostat housing, deplete the cooling system, disconnect the coolant hoses, engine coolant temperature sensor, and gauge sender. Unscrew the bolts and remove the thermostat housing and dispose of the O-ring seal. In order to install it, reverse the instructions and restore the cooling system.