Oil Cooler

On some engines engine oil is cooled using an oil cooler.

The oil cooler is mounted either to the cylinder block or under the oil filter adapter.

Engine oil enters the cooler. The cooler being made up of multiple tubes submersed in engine coolant. Allows the oil to disperse heat into the coolant. The coolant then flows to the radiator where it is then cooled.

• Heater water hose (18472) and heater core (18476). The heater or climate control system uses engine heat to heat the passenger compartment of the vehicle. On vehicles with standard heaters, coolant circulates through the heater core whenever the engine is running. Heater output controlled by air door function. On vehicles with air conditioning systems, a valve controlled by the A/C system may control coolant flow to the heater core. Refer to Group 12 for further information.

Coolant flows from the radiator through the lower radiator hose to the engine-driven water pump. This pump forces the coolant through the engine oil cooler (if equipped), engine block and cylinder head passageways. If the thermostat is closed, coolant returns to the water pump through the bypass hose or a bypass passageway in the engine. If the thermostat is open, the coolant passes back into the radiator where air passing over the radiator tubes removes the excess heat.

Engine Coolant Flow, 7.3L Diesel

Item	Part Number	Description
1	8005	Radiator
2	8075	Radiator Overflow Hose
3	8575	Water Thermostat
4	8A080	Radiator Coolant Recovery Reservoir
5	8592	Water Hose Connection
6	6019	Engine Front Cover
7	6010	Cylinder Block
8	6049	Cylinder Head
9	6731	Oil Filter
10	6A642	Oil Cooler
11	6A051	Block Heater
12	8501	Water Pump
13	8100	Radiator Cap
14	8A020	Degas Bottle