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Radiator electric cooling fan(s) - testing, removal and refitting
Cooling, heating, and air conditioning systems / Radiator electric cooling fan(s) - testing, removal and refitting


Note: Refer to the warnings given in Section 1 of this Chapter before starting work.

Testing
1 The radiator cooling fan is controlled by the engine management system’s ECU, acting on the information received from the coolant temperature sensor. Where twin fans or twospeed fans are fitted, control is through a resistor assembly, secured to the bottom lefthand corner of the fan shroud - this can be renewed separately if faulty.

2 First, check the relevant fuses and relays (see Chapter 12).

3 To test the fan motor, unplug the electrical connector, and use fused jumper wires to connect the fan directly to the battery. If the fan still does not work, renew the motor.

4 If the motor proved sound, the fault lies in the coolant temperature sensor (see Section 6 for testing details), in the wiring loom (see Chapter 12 for testing details) or in the engine management system (see Chapter 6).

Removal and refitting
5 Disconnect the battery negative (earth) lead (see Chapter 5, Section 1).

6 Unbolt the resonator support bracket from the engine compartment front crossmember.

Slacken the two clamp screws securing the resonator to the air mass meter and plenum chamber hoses, then swing the resonator up clear of the thermostat housing (see Chapter 4).

7 Drain the cooling system (see Chapter 1).

8 Remove the radiator top hose completely.

Disconnect the metal coolant pipe/hose from the thermostat, and unbolt the coolant pipe from the exhaust manifold heat shield.

9 Unplug the cooling fan electrical connector(s), then release all wiring and hoses from the fan shroud.

10 Unscrew the two nuts securing the fan shroud, then lift the assembly to disengage it from its bottom mountings and from the radiator top edge (see illustrations).

5.10A Fan shroud is secured at top by mounting nut (A), at bottom by clip (B)
5.10A Fan shroud is secured at top by mounting nut (A), at bottom by clip (B) . . .

5.10B . . . and is hooked over radiator top edge (one point arrowed)
5.10B . . . and is hooked over radiator top edge (one point arrowed)

11 Withdraw the fan and shroud as an assembly (see illustration).

5.11 Removing radiator electric cooling fan and shroud assembly
5.11 Removing radiator electric cooling fan and shroud assembly

12 At the time of writing, the fan, motor and shroud are available only as a complete assembly, and must be renewed together if faulty.

13 Refitting is the reverse of the removal procedure. Ensure that the shroud is settled correctly at all four mounting points before refitting and tightening the nuts.


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