How to service the thermostat on Mercury Cougar?

Service of the thermostat starts with draining the cooling system followed by disconnecting the thermostat hoses. First remove the thermostat cover by removing its three bolts until the cover detaches. Following the next step you should remove the thermostat along with its O-ring seal for removal. Installation of the unit requires the reverse steps of removing the new O-ring seal followed by cooling system refilling.

How to service the thermostat housing on a 2.3L engine on Mercury Mariner?

The service process for thermostat housing on a 2.3L engine starts with hoisting the vehicle while keeping the transmission in neutral position. Start by draining the cooling system followed by accessory drive belt removal. First disconnect both heater hose and lower radiator hose connections which exist in the thermostat housing area. The service begins with removing three housing bolts secured by three gasket bolts before tightening the new housing installation at 10 Nm (89 inch lbs.) torque. Check the gasket condition during the inspection process and change it with a fresh one when required. The cooling system needs to be filled after which it must be bled to finish the operation.

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: YF1Z-8575-BA
$9.69 MSRP: $15.38
You Save: $5.69 (37%)
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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: 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
$5.56 MSRP: $8.22
You Save: $2.66 (33%)
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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: 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: 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-A
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: 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

OEM Thermostat boasts unmatched quality. Each part goes through full quality checks. They adhere to Mercury's official factory standards. These steps remove flaws and inconsistencies. So you can get Thermostat with long life and a perfect fit. Come to our website and find genuine Mercury parts. We keep a wide inventory of OEM parts at the highly affordable prices. It's easy to search, compare, and pick what you need. You'll love the clear info and simple checkout. We offer top-rated customer service, and we reply fast. We also ship promptly to ensure your order arrives on time.

Mercury Thermostat Parts and Q&A

Thermostat
F8RZ-8575-BA
Q: How to service the thermostat on Mercury Cougar?
A:
Service of the thermostat starts with draining the cooling system followed by disconnecting the thermostat hoses. First remove the thermostat cover by removing its three bolts until the cover detaches. Following the next step you should remove the thermostat along with its O-ring seal for removal. Installation of the unit requires the reverse steps of removing the new O-ring seal followed by cooling system refilling.
Thermostat Housing
3M4Z-8575-B
Q: How to service the thermostat housing on a 2.3L engine on Mercury Mariner?
A:
The service process for thermostat housing on a 2.3L engine starts with hoisting the vehicle while keeping the transmission in neutral position. Start by draining the cooling system followed by accessory drive belt removal. First disconnect both heater hose and lower radiator hose connections which exist in the thermostat housing area. The service begins with removing three housing bolts secured by three gasket bolts before tightening the new housing installation at 10 Nm (89 inch lbs.) torque. Check the gasket condition during the inspection process and change it with a fresh one when required. The cooling system needs to be filled after which it must be bled to finish the operation.