How to service the thermostat for 4.6L and 5.4L engines on 2003 Ford F-150?

A partial drain of the cooling system should be your first step before servicing a thermostat for 4.6L and 5.4L engines. After disconnecting the upper radiator hose service personnel must unscrew the bolts from the water outlet connection. You should remove the water thermostat along with its O-ring seal from your vehicle before discarding the old O-ring seal. The installation requires a new O-ring seal for seating the water thermostat in the upper intake manifold after which you reinstall the water outlet connection with bolts. End the process by reattaching the upper radiator hose and performing a system fill-up.

OEM 2003 Ford F-150 Thermostat

Engine Coolant Thermostat

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3 Thermostats found

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2003 Ford F-150 Thermostat Part Number: 7L3Z-8575-E
$20.68 MSRP: $32.00
You Save: $11.32 (36%)
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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
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 7L3Z-8575-E
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following 2003 Ford F-150 Submodels:
- Base, FX2, FX4, Harley-Davidson Edition, King Ranch, Lariat, Lariat Limited, Lightning, Limited, Platinum, STX, SVT Raptor, THE 60TH ANNIVERSARY EDITION, XL, XLT | 8 Cyl 4.6 L GAS, 8 Cyl 5.4 L BI-FUEL, 8 Cyl 5.4 L CNG, 8 Cyl 5.4 L FLEX, 8 Cyl 5.4 L GAS, 8 Cyl 6.2 L GAS
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2003 Ford F-150 Thermostat Part Number: XL3Z-8575-AA
$14.95 MSRP: $24.11
You Save: $9.16 (38%)
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Product Specifications
- Other Name: Thermostat Assembly; Engine Coolant Thermostat
- Base No.: 8575
- Item Weight: 0.40 Pounds
- Item Dimensions: 6.1 x 4.1 x 4.1 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: XL3Z-8575-AA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
More Info
Fits the following 2003 Ford F-150 Submodels:
- Harley-Davidson Edition, Lightning | 8 Cyl 5.4 L GAS
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2003 Ford F-150 Thermostat Part Number: XL3Z-8575-BA
$14.31 MSRP: $23.09
You Save: $8.78 (39%)
ADD TO CART
Product Specifications
- Other Name: Thermostat Assembly; Engine Coolant Thermostat
- Manufacturer Note: Thermostat-192 #XL3E 8575-AA
- Replaces: F85Z-8575-AA
- Base No.: 8575
- Item Weight: 0.50 Pounds
- Item Dimensions: 6.1 x 4.2 x 4.2 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: XL3Z-8575-BA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
More Info
Fits the following 2003 Ford F-150 Submodels:
- Base, STX, XL, XLT | 6 Cyl 4.2 L GAS

2003 Ford F-150 Thermostat

If you're seeking quality and affordability, look no further than our extensive inventory of genuine 2003 Ford F-150 Thermostat available at FordPartsDeal.com. You can confidently purchase our OEM 2003 Ford F-150 Thermostat as they are supported by the manufacturer's warranty and our hassle-free return policy, alongside the benefit of our fast delivery service.

2003 Ford F-150 Thermostat Parts Q&A

Q: How to service the thermostat for 4.6L and 5.4L engines on 2003 Ford F-150?
A: A partial drain of the cooling system should be your first step before servicing a thermostat for 4.6L and 5.4L engines. After disconnecting the upper radiator hose service personnel must unscrew the bolts from the water outlet connection. You should remove the water thermostat along with its O-ring seal from your vehicle before discarding the old O-ring seal. The installation requires a new O-ring seal for seating the water thermostat in the upper intake manifold after which you reinstall the water outlet connection with bolts. End the process by reattaching the upper radiator hose and performing a system fill-up.