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

Service of a 2.3L thermostat housing requires first placing the vehicle into neutral and hoisting it before proceeding. First drain the cooling system fluid before you remove the accessory drive belt. The first step includes disconnecting both heater hose and lower radiator hose at the thermostat housing. The three bolts holding the thermostat housing should be removed. During new thermostat housing installation you must tighten the bolts to 10 Nm which equals 89 inch lbs. The gasket requires cleaning and inspection before deciding to use a new replacement unit. Bleeding and filling the cooling system will finalize the maintenance process.

OEM Mercury Mariner Thermostat

Engine Coolant Thermostat

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Mercury Mariner Thermostat Part Number: 1X4Z-8575-EB
$9.58 MSRP: $15.45
You Save: $5.87 (38%)
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Product Specifications
- Other Name: Thermostat Assembly; Engine Coolant Thermostat
- Replaces: 1X4Z-8575-EA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2008-2011, 2005-2006 Mercury Mariner | Base, Luxury, Premier | 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS
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Mercury Mariner Thermostat Unit Part Number: 4L5Z-8575-B
$32.75 MSRP: $52.00
You Save: $19.25 (38%)
Ships in 1-2 Business Days
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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
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2008, 2005-2006 Mercury Mariner | Base, Convenience, Hybrid | 4 Cyl 2.3 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.3 L GAS
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Mercury Mariner Thermostat Housing Part Number: 3M4Z-8575-B
$30.23 MSRP: $48.00
You Save: $17.77 (38%)
Ships in 1 Business Day
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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
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2006-2011 Mercury Mariner | 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

Mercury Mariner 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 Mariner parts. We keep a wide inventory of OEM Mariner 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.

Relative to the above features, the main operation of the Thermostat in Mercury Mariner vehicles is to control the temperature of the engine to the required levels. Commonly, it is situated near the radiator; a closed-loop feedback control device, the Thermostat helps to maintain the set temperature. Different kinds of Thermostats have been used in the past, mechanical Thermostats such as the bimetallic strip or the wax pellet, and pneumatic which uses air filled control tubes. These Thermostats function, by either turning on/off heating or cooling devices or will control the circulation of heat transfer fluids. The innovation in the manufacturing of thermostats has boosted the performance of heating systems especially for homes, industries, and Mercury Mariner vehicle making them comfortable to use.

Mercury Mariner 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:
Service of a 2.3L Thermostat Housing requires first placing the vehicle into neutral and hoisting it before proceeding. First drain the cooling system fluid before you remove the accessory Drive Belt. The first step includes disconnecting both heater hose and lower radiator hose at the thermostat housing. The three bolts holding the thermostat housing should be removed. During new thermostat housing installation you must tighten the bolts to 10 Nm which equals 89 inch lbs. The gasket requires cleaning and inspection before deciding to use a new replacement unit. Bleeding and filling the cooling system will finalize the maintenance process.