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Dorman 902-818 Engine Coolant Thermostat Housing Assembly - Water Pump
| Brand | Dorman 902-818 |
|---|---|
| Position | Water Pump |
| Bleeder Hole | No |
| Bolt Hole Center To Bolt Hole Center | 2.74 in; 2.79; 2.76 in; 2.71 in |
| Color | Silver |
| Flange Length | 3.31 |
| Flange Thickness | 0.398 |
| Flange Width | 3.31 |
| Gasket Or Seal Included | Yes |
| Gasket Type | Gasket |
| Grade Type | Regular |
| Inside Diameter | 1.36 |
| Material | Aluminum |
| Mounting Hardware Included | No |
| Mounting Hole Quantity | 4 |
| Outlet Port Quantity | 1 |
| Package Contents | 1 Thermostat Housing Assembly; 1 Sensor |
| Thermostat Included | Yes |
| Thermostat Opening Temperature | 221 Deg. F. |
| Fits | BMW · 7 vehicles |
OE-style replacement. Engineered to match stock housing fit and durability.
Aluminum construction. Helps withstand extreme temperature changes for longer service life.
Gasket included. Ready for a more complete thermostat housing installation.
Cross-references Beck/Arnley 143-0891, Dorman - HELP 47021 and Four Seasons 85959 for the same application. See all 10.
Engine Coolant Thermostat Housing Assembly
Dorman 902-818 is a replacement engine coolant thermostat housing assembly built for the fit and durability of the original housing on specified BMW applications. It uses an aluminum housing with a gasket included and an integrated thermostat to support stable coolant flow in high-heat operating conditions.
Key Features
- Aluminum construction with a silver finish
- Integrated thermostat with a 221 Deg. F opening temperature
- Gasket included for sealing at installation
- Four mounting holes and one outlet port
- Package contents include the thermostat housing assembly and sensor
- Engineered for BMW 540i, 740i, and 740iL water pump applications
Detailed Description
This Dorman thermostat housing assembly, part number 902-818, is designed for BMW cooling system service where the original housing has worn, cracked, or lost sealing integrity. The aluminum body is built to handle repeated temperature swings, while the integrated thermostat helps regulate coolant temperature in the engine coolant circuit. It is a direct-fit style replacement for 1996-1998 BMW 740iL, 1997-1998 BMW 540i, and 1997-1998 BMW 740i water pump applications. This part cross-references Gates 34727 and Motorad 470-221 for the same application.
Common Repair Uses
- Coolant leaks at the thermostat housing
- Cracked or warped original housing
- Temperature control issues from a failing thermostat
- Sealing problems at the housing gasket surface
- Cooling system service on BMW 540i, 740i, and 740iL models
Installation Notes and Tips
Verify the housing shape, outlet location, and sensor connection before installation. Clean the mating surface thoroughly and replace any damaged coolant hoses or seals during service. Follow the vehicle service procedure for coolant refill and air bleeding after installation to help restore proper cooling system operation.
Quality Assurance
Dorman designs this replacement housing to match the fit and durability of the stock assembly and to withstand extreme temperature changes for extended service life.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 1998 | BMW | 540i | 4.4L | V8 | Water Pump | Engine coolant thermostat housing assembly with integrated cover. |
| 1998 | BMW | 740i | 4.4L | V8 | Water Pump | Engine coolant thermostat housing assembly with integrated cover. |
| 1998 | BMW | 740iL | 4.4L | V8 | Water Pump | Engine coolant thermostat housing assembly with integrated cover. |
| 1997 | BMW | 540i | 4.4L | V8 | Water Pump | Engine coolant thermostat housing assembly with integrated cover. |
| 1997 | BMW | 740i | 4.4L | V8 | Water Pump | Engine coolant thermostat housing assembly with integrated cover. |
| 1997 | BMW | 740iL | 4.4L | V8 | Water Pump | Engine coolant thermostat housing assembly with integrated cover. |
| 1996 | BMW | 740iL | 4.4L | V8 | Water Pump | Engine coolant thermostat housing assembly with integrated cover. |
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