How to service the thermostat on Mercury Cougar?

To service the thermostat, empty the cooling system and take off the hoses. To change the thermostat cover, unscrew three bolts, then remove the thermostat and dispose the O-ring seal. To install, revert: remove an old O-ring seal and replace it with a new one, and refill the cooling system.

How to service the thermostat on Mercury Sable?

To maintain the thermostat, the first step is to partially empty the engine cooling system. Then, unscrew the three bolts of the thermostat housing and remove the O-ring seal. Inspect the surfaces of seals. Lastly, undo the uninstallation procedure and install the software.

OEM Mercury Thermostat

Engine Coolant Thermostat

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21 Thermostats found

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Mercury Thermostat Part Number: YU3Z-8575-AA
$33.43 MSRP: $53.09
You Save: $19.66 (38%)
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Product Specifications
- Other Name: Thermostat Assembly; Engine Coolant Thermostat; Thermostat Insert Fo
- Replaces: F7TZ-8575-A
Fits the following Mercury Models:
- Mountaineer | 1998-2001 | Base | 6 Cyl 4.0 L GAS
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Mercury Thermostat Part Number: 7L3Z-8575-E
$20.68 MSRP: $32.00
You Save: $11.32 (36%)
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Product Specifications
- Other Name: Thermostat Assembly; Engine Coolant Thermostat; Thermostat, Coolant
- Replaces: 7L3Z-8575-D, 7L3Z-8575-B, AL3Z-8575-B, RT-1196, RT-1230, 3L3Z-8575-AA, 3L3Z-8575-AC, 7L3Z-8575-C, AL3Z-8575-A, RT-1204, RT-1234, RT-1178, RT-1229, RT-1165
Fits the following Mercury Models:
- Cougar | 1994-1997 | XR-7 | 8 Cyl 4.6 L GAS
- Grand Marquis | 1992-2011 | GS, GSL, Limited Edition, LS, LSE, Ultimate Edition | 8 Cyl 4.6 L FLEX, 8 Cyl 4.6 L GAS
- Marauder | 2003-2004 | Base | 8 Cyl 4.6 L GAS
- Mountaineer | 2002-2010 | Base, Convenience, Luxury, Premier | 8 Cyl 4.6 L GAS
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Mercury Thermostat Part Number: 2L2Z-8575-AA
$21.07 MSRP: $33.45
You Save: $12.38 (38%)
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Product Specifications
- Other Name: Thermostat Assembly; Engine Coolant Thermostat
- Replaces: 1L2Z-8575-AA
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 Part Number: F5OY-8575-A
$12.85 MSRP: $20.40
You Save: $7.55 (38%)
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Product Specifications
- Other Name: Thermostat Assembly
Fits the following Mercury Models:
- Marauder | 2003-2004 | Base | 8 Cyl 4.6 L GAS
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Mercury Thermostat Housing Part Number: 3M4Z-8575-B
$30.23 MSRP: $48.00
You Save: $17.77 (38%)
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Product Specifications
- Other Name: Thermostat Assembly; Engine Coolant Thermostat Kit; Thermostat Housing Cover; Thermostat Integral; Thermostat, Coolant; Thermostat Unit; Thermostat; Engine Coolant Thermostat
- Replaces: 3M4Z-8575-A, 3M4Z-8575-AB
Fits the following Mercury Models:
- Mariner | 2006-2011 | Base, Hybrid, Premier | 4 Cyl 2.3 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.5 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.5 L GAS
- Milan | 2006-2011 | Base, Hybrid, Premier | 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.5 L GAS
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Mercury Thermostat Unit Part Number: 4L5Z-8575-B
$32.75 MSRP: $52.00
You Save: $19.25 (38%)
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Product Specifications
- Other Name: Thermostat Assembly; Engine Coolant Thermostat; Thermostat Integral; Thermostat
- Replaces: 4L5Z-8575-A, 4L5Z-8575-AA, 4L5Z-8575-AD
Fits the following Mercury Models:
- Mariner | 2008, 2005-2006 | Base, Convenience, Hybrid | 4 Cyl 2.3 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.3 L GAS
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Mercury Thermostat Part Number: F8RZ-8575-CA
$13.28 MSRP: $21.09
You Save: $7.81 (38%)
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Product Specifications
- Other Name: Thermostat Assembly; Engine Coolant Thermostat
- Replaces: F5RZ-8575-A, F8RZ-8575-AA
Fits the following Mercury Models:
- Cougar | 1999-2002 | Base | 4 Cyl 2.0 L GAS
- Mystique | 1995-2000 | Base, GS, GS Spree, LS | 4 Cyl 2.0 L GAS
- Tracer | 1998-1999 | GS, LS, Trio | 4 Cyl 2.0 L GAS
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Mercury Thermostat Part Number: 5F9Z-8575-A
$20.33 MSRP: $31.45
You Save: $11.12 (36%)
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Product Specifications
- Other Name: Thermostat Assembly; Engine Coolant Thermostat
- Replaces: 5F9Z-8575-AA, RT-1182
Fits the following Mercury Models:
- Montego | 2005-2007 | Luxury, Premier | 6 Cyl 3.0 L GAS
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Mercury Thermostat Part Number: F5RZ-8575-B
$5.64 MSRP: $8.22
You Save: $2.58 (32%)
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Product Specifications
- Other Name: Thermostat Assembly; Engine Coolant Thermostat
- Manufacturer Note: 24V
Fits the following Mercury Models:
- Mystique | 1995-1997 | Base, GS, GS Spree, LS, LS Young America | 6 Cyl 2.5 L GAS
- Sable | 1996-2000 | G, GS, LS, LS Premium | 6 Cyl 3.0 L GAS
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Mercury Thermostat Part Number: XF5Z-8575-AA
$9.64 MSRP: $13.34
You Save: $3.70 (28%)
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Product Specifications
- Other Name: Thermostat Assembly; Engine Coolant Thermostat; Thermostat, Coolant
- Manufacturer Note: Thermostat , #XF52 8575,AA
- Replaces: F7XY-8575-AA
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 Part Number: KU2Z-8575-A
$7.93 MSRP: $10.79
You Save: $2.86 (27%)
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Product Specifications
- Other Name: Thermostat Assembly; Engine Coolant Thermostat
- Replaces: F8CZ-8575-AA, F6TZ-8575-AC, YS4Z-8575-AA
Fits the following Mercury Models:
- Topaz | 1992-1994 | GS, LS, LTS, Sport | 4 Cyl 2.3 L GAS
- Tracer | 1991-1999 | Base, GS, LS, Trio | 4 Cyl 1.9 L GAS, 4 Cyl 2.0 L GAS
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Mercury Thermostat Part Number: XR3Z-8575-BA
$7.31 MSRP: $11.31
You Save: $4.00 (36%)
Product Specifications
- Other Name: Thermostat Assembly; Engine Coolant Thermostat
- Manufacturer Note: Thermostat 192 #XR3E 8597-BA
- Replaces: F88Z-8575-AA, E8TZ-8575-A, XL2Z-8575-AB
Fits the following Mercury Models:
- Colony Park | 1987-1991 | GS, LS | 8 Cyl 5.0 L GAS
- Cougar | 1992-1993 | LS, XR-7 | 8 Cyl 5.0 L GAS
- Grand Marquis | 1986-1991 | Base, Colony Park, GS, LS | 8 Cyl 5.0 L GAS, 8 Cyl 5.8 L GAS
- Monterey | 2004-2007 | Base, Convenience, Luxury, Premier | 6 Cyl 4.2 L GAS
- Mountaineer | 1997-1998 | Base | 8 Cyl 5.0 L GAS
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Mercury Thermostat Part Number: YF1Z-8575-BA
$9.94 MSRP: $15.38
You Save: $5.44 (36%)
Product Specifications
- Other Name: Thermostat Assembly; Engine Coolant Thermostat
- Replaces: F58Z-8575-A, F5DZ-8575-A
Fits the following Mercury Models:
- Cougar | 1992-1995 | LS, XR-7 | 6 Cyl 3.8 L GAS
- Sable | 2000-2005, 1992-1995 | GS, LS, LS Premium, LTS, Platinum Edition | 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS, 6 Cyl 3.8 L GAS
- Topaz | 1992-1994 | GS, LTS, Sport, XR5 | 6 Cyl 3.0 L GAS
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Mercury Thermostat Part Number: F8RZ-8575-BA
$4.92 MSRP: $6.98
You Save: $2.06 (30%)
Product Specifications
- Other Name: Thermostat Assembly; Engine Coolant Thermostat
Fits the following Mercury Models:
- Cougar | 1999-2002 | Base, S, V6 | 6 Cyl 2.5 L GAS
- Mystique | 1998-2000 | LS | 6 Cyl 2.5 L GAS
- Sable | 2001-2005 | LS, LS Premium, Platinum Edition | 6 Cyl 3.0 L GAS
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Mercury Thermostat Part Number: 1X4Z-8575-B
$15.63 MSRP: $24.18
You Save: $8.55 (36%)
Product Specifications
- Other Name: Thermostat Assembly; Engine Coolant Thermostat
- Replaces: 1X4Z-8575-A, 1X4Z-8575-FA, RT-1228, RT-1172
Fits the following Mercury Models:
- Sable | 2008-2009 | Base, Premier | 6 Cyl 3.5 L GAS
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Mercury Thermostat Part Number: E73Z8575A
Product Specifications
- Other Name: Thermostat Assembly; Engine Coolant Thermostat
Fits the following Mercury Models:
- Topaz | 1984-1987 | Base, GS, GS AWD, LS, LS AWD, Sport, Sport AWD, XR5 | 4 Cyl 2.3 L GAS
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Mercury Thermostat Part Number: F1CZ-8575-A
Product Specifications
- Other Name: Thermostat Assembly; Engine Coolant Thermostat
Fits the following Mercury Models:
- Tracer | 1988-1989 | Base | 4 Cyl 1.6 L GAS
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Mercury Thermostat Part Number: F1CZ-8575-C
Product Specifications
- Other Name: Thermostat Assembly; Engine Coolant Thermostat
Fits the following Mercury Models:
- Tracer | 1991-1996 | LTS | 4 Cyl 1.8 L GAS
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Mercury Valve Cover Gasket Part Number: E6DZ8575B
Product Specifications
- Other Name: Thermostat; Engine Coolant Thermostat; Exhaust Valve Seals; Intake Valve Seals
Fits the following Mercury Models:
- Sable | 1986-1991 | GS, LS | 6 Cyl 3.0 L GAS
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Mercury Thermostat Part Number: KU2Z-8575-B
Product Specifications
- Other Name: Thermostat Assembly; Engine Coolant Thermostat
- Replaces: F6DZ-8575-AA, F6ZZ-8575-A, F8DZ-8575-AA
Fits the following Mercury Models:
- Cougar | 1996-1997 | XR-7 | 6 Cyl 3.8 L GAS
- Sable | 1996-1999 | G, GS, LS, LS Premium | 6 Cyl 3.0 L GAS

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Mercury Thermostat Parts and Q&A

Thermostat
F8RZ-8575-BA
Q: How to service the thermostat on Mercury Cougar?
A: To service the thermostat, empty the cooling system and take off the hoses. To change the thermostat cover, unscrew three bolts, then remove the thermostat and dispose the O-ring seal. To install, revert: remove an old O-ring seal and replace it with a new one, and refill the cooling system.
Thermostat
YF1Z-8575-BA
Q: How to service the thermostat on Mercury Sable?
A: To maintain the thermostat, the first step is to partially empty the engine cooling system. Then, unscrew the three bolts of the thermostat housing and remove the O-ring seal. Inspect the surfaces of seals. Lastly, undo the uninstallation procedure and install the software.