How to replace a thermostat in a cooling system on Ford F-250?

Before assuming the thermostat is to blame, check coolant level, fan operation, and temperature gauge. If engine takes a long time to warm up, thermostat is stuck open. Replace it. If engine runs hot, check upper radiator hose temperature. If hose isn't hot, thermostat is stuck closed. Replace it. Caution: Don't drive without a thermostat. If upper radiator hose is hot, coolant is flowing. Drain radiator below thermostat. Remove coolant outlet elbow bolts, pull elbow away to access thermostat. Remove thermostat and gasket. Disconnect bypass hoses. Remove bypass tube and water outlet housing bolts. Bend radiator hose upward and remove thermostat and gasket. Clean surfaces, coat new gasket with sealer. Install thermostat in elbow, turn to lock. Position elbow against cylinder head and tighten bolts. Coat new gasket with sealer. Position gasket on intake manifold. Install thermostat in manifold. Position water outlet housing against manifold and tighten bolts. Install water bypass line and tighten hose connections. Fill cooling system with coolant. Start engine, check coolant level and leaks.

Genuine Ford F-250 Thermostat

Engine Coolant Thermostat

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5 Thermostats found

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Ford F-250 Thermostat Assembly
Part Number: F4TZ-8575-A
$28.08 MSRP: $54.36
You Save: $26.28 (49%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Thermostat Assy
- Manufacturer Note: Thermostat - 192 , DI Turbo
- Replaced by: F4TZ-8575-CB
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1994-1995 Ford F-250 | 8 Cyl 7.3L | 3AT C6, 4AT E4OD, 4MT, 5MT
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Ford F-250 Thermostat Assembly
Part Number: E5TZ-8575-C
$28.73 MSRP: $45.82
You Save: $17.09 (38%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermostat Assy; Thermostat
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1983-1994 Ford F-250 | 6 Cyl 4.9L, 8 Cyl 5.0L, 8 Cyl 5.8L, 8 Cyl 6.9L, 8 Cyl 7.3L, 8 Cyl 7.5L | 3AT C6, 3MT, 4AT AOD, 4AT E4OD, 4MT, 5MT
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Ford F-250 Thermostat Assembly
Part Number: F6TZ-8575-AA
$34.43 MSRP: $54.91
You Save: $20.48 (38%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Thermostat Assy
- Replaced by: F6TZ-8575-EA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1996 Ford F-250 | 8 Cyl 7.3L | 3AT C6, 4AT E4OD, 5MT
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Ford F-250 Thermostat Assembly
Part Number: E8TZ-8575-A
$7.09 MSRP: $11.31
You Save: $4.22 (38%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Thermostat
- Replaced by: XR3Z-8575-BA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1988-1989 Ford F-250 | 6 Cyl 4.9L, 8 Cyl 5.0L, 8 Cyl 5.8L, 8 Cyl 7.3L, 8 Cyl 7.5L | 3AT C6, 3MT, 4AT AOD, 4AT E4OD, 4MT, 5MT
View related parts
Ford F-250 Thermostat Assembly
Part Number: E8TZ-8575-B
Product Specifications
- Other Name: Thermostat Assy; Thermostat
- Manufacturer Note: Thermostat - 192
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1990-1996 Ford F-250 | 8 Cyl 7.5L | 3AT C6, 4AT AOD, 4AT E4OD, 4MT, 5MT

Ford F-250 Thermostat Parts Questions & Experts Answers

Thermostat Assembly
E5TZ-8575-C
Q: How to replace a thermostat in a cooling system on Ford F-250?
A: Before assuming the thermostat is to blame, check coolant level, fan operation, and temperature gauge. If engine takes a long time to warm up, thermostat is stuck open. Replace it. If engine runs hot, check upper radiator hose temperature. If hose isn't hot, thermostat is stuck closed. Replace it. Caution: Don't drive without a thermostat. If upper radiator hose is hot, coolant is flowing. Drain radiator below thermostat. Remove coolant outlet elbow bolts, pull elbow away to access thermostat. Remove thermostat and gasket. Disconnect bypass hoses. Remove bypass tube and water outlet housing bolts. Bend radiator hose upward and remove thermostat and gasket. Clean surfaces, coat new gasket with sealer. Install thermostat in elbow, turn to lock. Position elbow against cylinder head and tighten bolts. Coat new gasket with sealer. Position gasket on intake manifold. Install thermostat in manifold. Position water outlet housing against manifold and tighten bolts. Install water bypass line and tighten hose connections. Fill cooling system with coolant. Start engine, check coolant level and leaks.