How to replace a thermostat in a Ford Expedition?

Don't drive without a thermostat as it can affect emissions and fuel economy. Before blaming the thermostat, check coolant level, drivebelt tension, and temperature gauge. If the engine takes long to warm up or runs hot without the upper radiator hose being hot, the thermostat is likely faulty and needs replacement. Overheating can cause engine damage. To replace the thermostat, drain coolant below the thermostat housing level, disconnect the upper radiator hose, remove the cover and O-ring seal, and note the thermostat's installation. Install a new thermostat with the correct opening temperature, clean the mating surfaces, and apply RTV sealant to a new gasket or O-ring seal. Reattach the cover, radiator hose, refill the system, check for leaks, and repeat steps if necessary.

Genuine Ford Expedition Thermostat

Engine Coolant Thermostat

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6 Thermostats found

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Ford Expedition Thermostat Assembly
Part Number: BL3Z-8575-A
$23.06 MSRP: $32.73
You Save: $9.67 (30%)
ADD TO CART
Product Specifications
- Other Name: Thermostat Assy; Thermostat
- Replaced by: BL3Z-8575-B
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2015-2017 Ford Expedition | 6 Cyl 3.5L GTDI | 4AT 4R75W, 4-Speed Automatic Transmission 4R70W (AODE), 4-Speed Automatic Transmission 4R75E Livonia, 4-Speed Automatic Transmission AODEW/4R75E W/TSS, 6-Speed Automatic Transmission (6R75), 6-Speed Automatic Transmission (6R80), Four-Wheel Drive (Part Time) (Left Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Ford Expedition Thermostat Assembly
Part Number: 7L3Z-8575-B
$21.78 MSRP: $30.91
You Save: $9.13 (30%)
ADD TO CART
Product Specifications
- Other Name: Thermostat Assy
- Replaced by: 7L3Z-8575-E
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2007-2014 Ford Expedition | 8 Cyl 5.4L | 4AT 4R75W, 4-Speed Automatic Transmission 4R70W (AODE), 4-Speed Automatic Transmission 4R75E Livonia, 4-Speed Automatic Transmission AODEW/4R75E W/TSS, 6-Speed Automatic Transmission (6R75), 6-Speed Automatic Transmission (6R80), Four-Wheel Drive (Part Time) (Left Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Ford Expedition Thermostat Assembly
Part Number: 3L3Z-8575-AC
$21.78 MSRP: $30.91
You Save: $9.13 (30%)
ADD TO CART
Product Specifications
- Other Name: Thermostat Assy
- Replaced by: 7L3Z-8575-E
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2003-2006 Ford Expedition | 8 Cyl 4.6L Romeo SOHC EFI, 8 Cyl 5.4L, 8 Cyl 5.4L Modular SOHC | 4AT 4R75W, 4-Speed Automatic Transmission 4R70W (AODE), 4-Speed Automatic Transmission 4R75E Livonia, 4-Speed Automatic Transmission AODEW/4R75E W/TSS, 6-Speed Automatic Transmission (6R75), 6-Speed Automatic Transmission (6R80), Four-Wheel Drive (Part Time) (Left Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
View related parts
Ford Expedition Thermostat Assembly
Part Number: HL3Z-8575-A
$22.17 MSRP: $31.45
You Save: $9.28 (30%)
ADD TO CART
Product Specifications
- Other Name: Thermostat Assy; Thermostat
- Replaced by: HL3Z-8575-B
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2018-2019 Ford Expedition | 6 Cyl 3.5L GTDI | 10-Speed Automatic Transmission (10R80), Four-Wheel Drive (Part Time) (Left Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Ford Expedition THERMOSTAT ASY
Part Number: HL3Z-8575-B
$22.17 MSRP: $31.45
You Save: $9.28 (30%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermostat
- Replaces: HL3Z-8575-A, RT-1238
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2018-2021 Ford Expedition | 6 Cyl 3.5 L GAS, 6 Cyl 3.5L GTDI | 10-Speed Automatic Transmission (10R80), Four-Wheel Drive (Part Time) (Left Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Ford Expedition THERMOSTAT ASY
Part Number: ML3Z-8575-A
$22.23 MSRP: $34.55
You Save: $12.32 (36%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermostat
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2022-2024 Ford Expedition | 6 Cyl 3.5 L FLEX, 6 Cyl 3.5 L GAS

Ford Expedition Thermostat Parts Questions & Experts Answers

Thermostat Assembly
3L3Z-8575-AC
Q: How to replace a thermostat in a Ford Expedition?
A: Don't drive without a thermostat as it can affect emissions and fuel economy. Before blaming the thermostat, check coolant level, drivebelt tension, and temperature gauge. If the engine takes long to warm up or runs hot without the upper Radiator hose being hot, the thermostat is likely faulty and needs replacement. Overheating can cause engine damage. To replace the thermostat, drain coolant below the thermostat housing level, disconnect the upper radiator hose, remove the cover and O-ring seal, and note the thermostat's installation. Install a new thermostat with the correct opening temperature, clean the mating surfaces, and apply RTV sealant to a new gasket or O-ring seal. Reattach the cover, radiator hose, refill the system, check for leaks, and repeat steps if necessary.