How to diagnose and address cooling system problems related to the thermostat on Mercury Mariner?

Check the coolant level, drive belt tension, and temperature gauge before blaming the thermostat. If the engine is hot but the lower radiator hose isn't, replace the stuck closed thermostat. If the hose is hot, further diagnose the cooling system. To replace the thermostat, disconnect the battery and drain the cooling system. Locate the thermostat housing, detach the hose, and replace it if corroded.

Genuine Mercury Mariner Thermostat

Engine Coolant Thermostat

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7 Thermostats found

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Mercury Mariner Thermostat Assembly
Part Number: 3M4Z-8575-B
$32.15 MSRP: $51.27
You Save: $19.12 (38%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Thermostat Assy; Thermostat, Thermostat Housing, Thermostat Unit
- Replaces: 3M4Z-8575-A, 3M4Z-8575-AB
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2011 Mercury Mariner | 4 Cyl 2.3L, 4 Cyl 2.3L Hybrid Gas/Electric DOHC, 4 Cyl 2.5L Duratec (110kW/150PS), 4 Cyl 2.5L PFI Gas/Electric | 4AT CD4E, 5-Speed Manual Transmission - AK, 6-Speed Automatic Transmission 6F Mid-Range, CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive
View related parts
Mercury Mariner Thermostat Assembly
Part Number: 4L5Z-8575-B
$42.98 MSRP: $68.55
You Save: $25.57 (38%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermostat Assy; Thermostat, Thermostat Unit
- 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 Mercury Mariner | 4 Cyl 2.3L | 4AT CD4E, 5-Speed Manual Transmission - AK, 6-Speed Automatic Transmission 6F Mid-Range, CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive
- 2005-2006 Mercury Mariner | 4 Cyl 2.3L | 4AT CD4E, 5-Speed Manual Transmission, 5-Speed Manual Transmission - AK, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Right Hand Drive), Left Hand Drive, Two-Wheel Drive (Left Hand Drive), Two-Wheel Drive (Right Hand Drive)
View related parts
Mercury Mariner Thermostat Assembly
Part Number: 3M4Z-8575-AB
$32.15 MSRP: $51.27
You Save: $19.12 (38%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Thermostat Assy
- Replaced by: 3M4Z-8575-B
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2007 Mercury Mariner | 4 Cyl 2.3L, 4 Cyl 2.3L Hybrid Gas/Electric DOHC | 4AT CD4E, 5-Speed Manual Transmission - AK, 6-Speed Automatic Transmission 6F Mid-Range, CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive
View related parts
Mercury Mariner Thermostat Assembly
Part Number: 3M4Z-8575-A
$32.15 MSRP: $51.27
You Save: $19.12 (38%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Thermostat Assy
- Replaced by: 3M4Z-8575-B
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2006-2007 Mercury Mariner | 4 Cyl 2.3L Hybrid Gas/Electric DOHC | 4AT CD4E, 5-Speed Manual Transmission - AK, 6-Speed Automatic Transmission 6F Mid-Range, CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive
View related parts
Mercury Mariner Thermostat Assembly
Part Number: 4L5Z-8575-A
$42.98 MSRP: $68.55
You Save: $25.57 (38%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermostat Assy
- Replaced by: 4L5Z-8575-B
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2006 Mercury Mariner | 4 Cyl 2.3L | 4AT CD4E, 5-Speed Manual Transmission, 5-Speed Manual Transmission - AK, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Right Hand Drive), Left Hand Drive, Two-Wheel Drive (Left Hand Drive), Two-Wheel Drive (Right Hand Drive)
View related parts
Mercury Mariner Thermostat Assembly
Part Number: 4L5Z-8575-AD
$42.98 MSRP: $68.55
You Save: $25.57 (38%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermostat Assy
- Manufacturer Note: 90°C
- Replaced by: 4L5Z-8575-B
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2006 Mercury Mariner | 4 Cyl 2.3L | 4AT CD4E, 5-Speed Manual Transmission, 5-Speed Manual Transmission - AK, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Right Hand Drive), Left Hand Drive, Two-Wheel Drive (Left Hand Drive), Two-Wheel Drive (Right Hand Drive)
View related parts
Mercury Mariner Thermostat Assembly
Part Number: 1X4Z-8575-EB
$9.54 MSRP: $15.45
You Save: $5.91 (39%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermostat Assy; Thermostat
- Replaces: 1X4Z-8575-EA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2011 Mercury Mariner | 6 Cyl 3.0L DOHC EFI Modular, 6 Cyl 3.0L OHC Duratec | 4AT CD4E, 5-Speed Manual Transmission, 5-Speed Manual Transmission - AK, 6-Speed Automatic Transmission 6F Mid-Range, CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Right Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive, Two-Wheel Drive (Left Hand Drive), Two-Wheel Drive (Right Hand Drive)

Mercury Mariner Thermostat

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.

We provide a wide range of Mercury Mariner Thermostat at the best prices possible. If you need Mercury Mariner Thermostat, you can shop with confidence on our website. All our OEM parts come with a manufacturer's warranty and are delivered to your door step with a fast delivery service.

Mercury Mariner Thermostat Parts Questions & Experts Answers

Thermostat Assembly
4L5Z-8575-AD
Q: How to diagnose and address cooling system problems related to the thermostat on Mercury Mariner?
A: Check the coolant level, drive belt tension, and temperature gauge before blaming the thermostat. If the engine is hot but the lower radiator hose isn't, replace the stuck closed thermostat. If the hose is hot, further diagnose the cooling system. To replace the thermostat, disconnect the battery and drain the cooling system. Locate the thermostat housing, detach the hose, and replace it if corroded.