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.

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.

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
$19.83 MSRP: $32.00
You Save: $12.17 (39%)
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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
$19.81 MSRP: $31.45
You Save: $11.64 (38%)
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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: 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: F5RZ-8575-B
$5.79 MSRP: $8.22
You Save: $2.43 (30%)
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: 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

If you own Mercury and want to keep it in top shape, choosing OEM Thermostat is a smart move. They are precisely engineered and follow strict factory standards. They are made in advanced facilities that use cutting edge technology. Each part goes through thorough testing to confirm strength and safety, so you can trust it. FordPartsDeal.com gives you genuine Mercury Thermostat at some of the affordable online prices without cutting quality. Every OEM Mercury part includes the manufacturer's warranty, easy returns, and super-fast delivery. So why wait? Shop now and get your vehicle back to peak condition.

Mercury Thermostat protects engines by opening and letting go of the heat at the appropriate time. In 1939, Mercury walked into showrooms with a swagger in the step, on a softer ride, but sharp lines that would attract drivers who desired something that was smoother than an ordinary means of transportation but not luxury badges. Mercury constructed cabins that silenced the sounds of the roads, included some suspension tuning to absorb the disintegrated pavement, and made sure that the price tags remained low to give the family the impression of value without experiencing cheapness. Mercury was willing to add creature comforts over the decades, broader seats, smarter dashboard; it was never about extreme power or smooth sailing. Titles such as Cougar and Grand Marquis were memorable given that they were a combination of aggressive speed as well as spacious interiors, which proved that the badge could remain cool even when the styles changed. Thermostat is installed close to the radiator and detects the temperature of the coolant and only opens when the heat is about to get out of hand and prevents warping of the engine metals and the cooking of oil. Thermostat operates as a closed-loop gate that measures the flow of coolant using a wax pellet or bimetal strip that moves at a calibration point which is tight to ensure that temperature fluctuations remain within a narrow range and fuel maps remain accurate when pulling hard during hot afternoons. The evolution of Thermostats is now pneumatic and digital with faster reaction time and gauge needles that are much more steady with no additional complication under the hood. There are not many Thermostat swaps since the robust capsule is not easily corroded and maintains sealing surfaces clean in mile after mile.

Mercury Thermostat Parts and Q&A

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.
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.