M54 engine cooling system BMW X5 E53

Engine cooling system — design description
The engine cooling system is liquid, sealed, with forced circulation. 1 - radiator; 2 - temperature sensor; 3, 17, 20, 22 - hose; 5 - bolt (M6x25); 6 -...

Radiator — design description
Radiator (1, Fig. 3.17) it is designed to remove heat from the coolant and is made in the form of a horizontally located set of aluminum tubes with right and...

Coolant pump — design description
Centrifugal type coolant pump (25. Fig. 3.17) fixed to the front timing belt cover of the engine cylinder block. 1 - radiator; 2 - temperature sensor; 3, 17,...

Thermostat — design description
Thermostat (6. Fig. 3.17) is designed to turn on and off the large circle of circulation of the engine coolant, depending on its temperature state. 1 -...

Expansion tank — design description
Expansion tank(see fig. 2.22) serves to fill the system with coolant, to provide volume for maintaining the expanding liquid as the temperature rises, and to...

Fan and viscous coupling
The fan has nine blades, is mounted on the coolant pump shaft and is designed to create air flow through the radiator. The fan impeller has a diameter of 420...

Coolant temperature sensor
The coolant temperature sensor is a three-pin sensor, mounted on the nipple on the left side of the engine cylinder head. Signals from the sensor are sent to...

Coolant (antifreeze)
The cooling liquid (antifreeze) used in engines is based on a mixture of antifreeze, anticorrosive liquid and softened water. When replacing antifreeze, be...

Checking the Thermostat
The thermostat, given its non-separable design, must be tested in the following order. Install the thermostat body on a container with water so that the...

Instructions for performing work on the cooling system
When working on the cooling system, there is always a risk of getting burned by steam, so all work should only be carried out on a cooled engine. The cooling...

Replacing the coolant
Coolant should be added through the expansion tank of the cooling system and of brands strictly certified by the BMW company. The mark on the expansion tank of...

Replacing the fan and its clutch
The engine cooling system uses an 11-blade fan with a diameter of 420 mm. The fan viscous coupling must be replaced if its hub has scoring that prevents the...

Replacing the coolant pump
The coolant pump is driven by a poly-V belt for the auxiliary drive. The fan impeller with a viscous coupling is fixed to the front of the pump shaft. The...

Replacing the cooling system thermostat
The thermostat is built into the housing (6, see Fig. 3.17) and it can only be replaced as a complete unit. 1 - radiator; 2 - temperature sensor; 3, 17, 20, 22...

Removal and installation the radiator
The radiator is changed if there are deposits (lime) in its tubes and the engine overheats for this reason. If oil gets into the radiator, it is necessary to...

Radiator flushing
Attention! If oil gets into the cooling system circuit, it is necessary to flush the radiator and radiator expansion tank with special cleaning agents....

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BMW E53 (1999-2006)