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Home >> Ford >> 2008 >> Expedition 4WD >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling System >> Description And Operation >> Engine Cooling

Engine Cooling

NOTE: Vehicle cooling systems are filled with Motorcraft Premium Gold Engine Coolant with Bittering Agent. Always fill the cooling system with the same type of coolant that was drained from the system. Do not mix coolant types. Failure to follow these instructions may result in engine or cooling system damage.

The cooling system consists of the following components:

The coolant pump:

The coolant thermostat:

The degas bottle:

The fan blade:

The fan clutch:

The radiator:

The optional block heater:

NOTE: Engine coolant provides freeze protection, boil protection, cooling efficiency and corrosion protection to the engine and cooling components. In order to obtain these protections, the engine coolant must be maintained at the correct concentration and fluid level in the degas bottle. Failure to follow these instructions may result in engine or cooling system damage.

When adding engine coolant, use a 50/50 mixture of engine coolant and distilled water.

To maintain the integrity of the coolant and the cooling system:

NOTE: Black arrows indicate hot, white arrows indicate cold.
Fig 1: Coolant Flow Diagram, Expedition & Navigator without Auxiliary Heater (1 Of 2)
GF0022054Courtesy of FORD MOTOR CO.
Item Part Number Description
1 18K580 Heater outlet hose
2 18K580 Heater outlet hose
3 18K579 Heater inlet hose
4 18K580 Heater inlet hose
5 18476 Heater core
6 8594 Thermostat housing
7 8575 Thermostat
8 8C369 Coolant crossover manifold assembly
9 18663 Heater coolant outlet tube
10 6050 LH cylinder head
11 6083 LH cylinder head gasket
12 8A080 Degas bottle
13 8C351 Degas bottle outlet hose
14 8W005 Degas bottle inlet hose
15 6881 Oil filter adapter
16 6010 Cylinder block
17 8501 Coolant pump
18 6049 RH cylinder head
19 8B273 Lower radiator hose
20 8B274 Upper radiator hose
21 8005 Radiator
NOTE: Black arrows indicate hot, white arrows indicate cold.
Fig 2: Coolant Flow Diagram, Expedition & Navigator without Auxiliary Heater (2 Of 2)
GF0022055Courtesy of FORD MOTOR CO.
Item Part Number Description
1 18K580 Heater outlet hose
2 18K579 Heater inlet hose
3 18K580 Heater outlet hose
4 18K580 Heater inlet hose
5 18476 Heater core
6 8594 Thermostat housing
7 8575 Thermostat
8 8C369 Coolant crossover manifold assembly
9 18663 Heater coolant outlet tube
10 18K470 Auxiliary heater core
11 18K470 Auxiliary heater tubes
12 6050 LH cylinder head
13 6083 LH cylinder head gasket
14 8A080 Degas bottle
15 8C351 Degas bottle outlet hose
16 8W005 Degas bottle inlet hose
17 6881 Oil filter adapter
18 8B273 Lower radiator hose
19 6010 Cylinder block
20 8501 Coolant pump
21 6049 RH cylinder head
22 18K470 Auxiliary heater tubes
23 8B274 Upper radiator hose
24 8005 Radiator
NOTE: Black arrows indicate hot, white arrows indicate cold.
Fig 3: Coolant Flow Diagram, Expedition EL & Navigator L with Auxiliary Heater
GF0022056Courtesy of FORD MOTOR CO.
Item Part Number Description
1 18K580 Heater outlet hose
2 18K579 Heater inlet hose
3 18K580 Heater outlet hose
4 18K580 Heater inlet hose
5 18476 Heater core
6 8594 Thermostat housing
7 8575 Thermostat
8 8C369 Coolant crossover manifold assembly
9 18663 Heater coolant outlet tube
10 18K470 Auxiliary heater core
11 18K470 Auxiliary heater tubes
12 6050 LH cylinder head
13 6083 LH cylinder head gasket
14 8A080 Degas bottle
15 8C351 Degas bottle outlet hose
16 8W005 Degas bottle inlet hose
17 6881 Oil filter adapter
18 8B273 Lower radiator hose
19 6010 Cylinder block
20 8501 Coolant pump
21 6049 RH cylinder head
22 18K470 Auxiliary heater tubes
23 8B274 Upper radiator hose
24 8005 Radiator