How to replace the Coolant Temperature Sensor on the Mercury Mariner?

This procedure applies to 2008 and earlier V6 models only. Begin by disconnecting the cable from the negative battery terminal. Next, drain the cooling system and remove the air intake duct. Locate the ECT sensor on the thermostat housing; on V6 models, the ECT sensor is situated there, while four-cylinder models utilize a CHT sensor. To remove the ECT sensor, disconnect the electrical connector and remove the retaining clip by pulling it straight up, then pull out the sensor. After that, remove and discard the old ECT sensor O-ring, ensuring to use a new O-ring when installing the ECT sensor, even if the old sensor is being reused. Installation follows the reverse order of removal. Finally, refill the cooling system, and after reconnecting the battery, allow the Powertrain Control Module (PCM) to relearn its idle and fuel trim strategy for optimal driveability and performance.

Genuine Mercury Mariner Coolant Temperature Sensor

Coolant Water Temperature Sensor

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Mercury Mariner Sender Assembly
Part Number: 3F1Z-12A648-A
$20.98 MSRP: $34.00
You Save: $13.02 (39%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Sender Assy
- Replaces: F5AZ-12A648-A, F5AZ-12A648-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, 6 Cyl 3.0L DOHC EFI Modular, 6 Cyl 3.0L OHC Duratec | CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive
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Mercury Mariner Sender Assembly
Part Number: F5AZ-12A648-AB
$20.98 MSRP: $34.00
You Save: $13.02 (39%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Sender Assy
- Replaced by: 3F1Z-12A648-A
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2010 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, 6 Cyl 3.0L DOHC EFI Modular, 6 Cyl 3.0L OHC Duratec | CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive
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Mercury Mariner Sensor - Engine Coolant Temperature
Part Number: 3L8Z-12A648-AA
$52.06 MSRP: $87.64
You Save: $35.58 (41%)
Ships in 1-2 Business Days
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Product Specifications
- Manufacturer Note: Rectangular connector with 2 flat pins, DOHC
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2008 Mercury Mariner | 6 Cyl 3.0L DOHC EFI Modular | 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)
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Mercury Mariner Temperature Sender Assembly
Part Number: F68Z-10884-AA
Product Specifications
- Other Name: Sender Assembly - Temperature
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2008 Mercury Mariner | 6 Cyl 3.0L DOHC EFI Modular | 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 Coolant Temperature Sensor

Coolant Temperature Sensor as a part of the Mercury Mariner vehicle is the vital one which is responsible for the control of the engine coolant temperature. Since this screw protrudes through the bottom of the water jacket and enjoys passage of fresh cool air, it is used to frequently check the temperature of the coolant and is thus very important in maintaining the efficiency of the engine. As much as there can be various kinds/brands of Coolant Temperature Sensors available in the different Mariner models, the fundamental purpose of use does not alter; it is About managing the temperature of the engine for efficient performance. This sensor is critical in avoiding high temperatures that may cause the engine to go up in flames or in maintaining temperatures that are appropriate for the engine.

We provide a wide range of Mercury Mariner Coolant Temperature Sensor at the optimal prices. If you need Mercury Mariner Coolant Temperature Sensor, you can shop with confidence on our website. All our OEM parts come with a manufacturer's warranty and are delivered to your doorstep with a fast delivery service.

Mercury Mariner Coolant Temperature Sensor Parts Questions & Experts Answers

Sender Assembly
F5AZ-12A648-AB
Q: How to replace the Coolant Temperature Sensor on the Mercury Mariner?
A:
This procedure applies to 2008 and earlier V6 models only. Begin by disconnecting the cable from the negative battery terminal. Next, drain the cooling system and remove the air intake duct. Locate the ECT sensor on the thermostat housing; on V6 models, the ECT sensor is situated there, while four-cylinder models utilize a CHT sensor. To remove the ECT sensor, disconnect the electrical connector and remove the retaining clip by pulling it straight up, then pull out the sensor. After that, remove and discard the old ECT sensor O-ring, ensuring to use a new O-ring when installing the ECT sensor, even if the old sensor is being reused. Installation follows the reverse order of removal. Finally, refill the cooling system, and after reconnecting the battery, allow the Powertrain Control Module (PCM) to relearn its idle and fuel trim strategy for optimal driveability and performance.