Rover 214 & 414 Service and Repair Manual - Rover club

3•6 Cooling, heating and ventilation systems
8.10a Undo cooling fan cowling retaining
nuts (2 arrowed) . . .
10 Undo the four nuts securing the cooling
fan cowling to the rear of the radiator and
manoeuvre the fan assembly out of the engine
compartment (see illustrations).
11 To dismantle the assembly, first prise off
the fan retaining circlip, then lift the fan off the
motor spindle. Undo the three nuts which
secure the motor assembly to the cowling
then release the motor wiring and connector
and separate the motor and cowling (see
illustration).
Refitting
12 Refitting is a reverse of the removal
procedure, noting the following:
a) If necessary, reassemble the fan motor,
cowling and fan, then tighten the motor
retaining nuts to the specified torque.
Ensure that the motor wiring is securely
retained by the cowling clips.
b) Ensure that the radiator hose is securely
held by its retaining clips.
c) On completion, refill the cooling system
as described in Chapter 1.
9 Cooling system electrical
switches - testing, removal
and refitting
2
Note: On models equipped with air
conditioning, there are two switches fitted to
the right-hand side of the radiator, the lower of
these is the cooling fan switch.
Testing
Cooling fan thermostatic switch
1 Refer to Section 8 for details of a quick test
which should eliminate most faulty switches.
If the switch is to be renewed, or to be tested
thoroughly, it must be removed.
2 To carry out a thorough test of the switch,
use two spare wires to connect to it either a
multimeter (set to the resistance function) or a
battery and bulb test circuit. Suspend the
switch in a pan of water which is being
heated. Measure the temperature of the water
with a thermometer. Do not let either the
switch or the thermometer touch the pan itself
(see illustration).
8.10b . . . and remove fan assembly
3 The switch contacts should close to the ON
position (ie: continuity should exist) when the
water reaches the temperature specified.
Stop heating the water and allow it to cool
down. The switch contacts should open.
4 If the switch’s performance is significantly
different from that specified, or if it does not
work at all, then it must be renewed.
Coolant temperature gauge sender
unit
5 The coolant temperature gauge mounted in
the instrument panel is fed with a stabilised 10
volt supply from the instrument panel feed (via
the ignition switch and fuse 1), its earth being
controlled by the sender unit.
6 The sender unit is screwed into the coolant
outlet elbow mounted on the left-hand end of
the cylinder head, underneath the distributor
(see illustration). It contains a thermistor,
which is an element whose electrical
resistance decreases at a predetermined rate
as its temperature rises. Thus, when the
coolant is cold, the sender’s resistance is
high, current flow through the gauge is
reduced and the gauge needle points to the
C (cold) end of the scale. If the unit is faulty it
must be renewed.
9.2 Testing cooling system electrical
switch
1689 Rover 214 & 414 Updated Version 09/97
8.11 Cooling fan motor retaining nuts
(arrowed)
7 If the gauge develops a fault, check first the
other instruments. If they do not work at all,
check the instrument panel feed. If the
readings are erratic, there may be a fault in the
voltage stabiliser which will necessitate the
renewal of the gauge unit or printed circuit. If
the fault is in the temperature gauge alone,
check it as follows.
8 If the gauge needle remains at the C end of
the scale, disconnect the sender unit wire and
earth it to the cylinder head. If the needle then
deflects when the ignition is switched on, then
the sender unit is proven faulty and must be
renewed. If the needle still does not move,
remove the instrument panel and check the
continuity of the green/blue wire between the
gauge and the sender unit and the feed to
the gauge unit. If continuity is shown and the
fault still exists, then the gauge is faulty and
the gauge unit must be renewed.
9 If the gauge needle remains at the H end of
the scale, disconnect the sender unit wire. If
the needle then returns to the C end of the
scale when the ignition is switched on, then
the sender unit is proven faulty and must be
renewed. If the needle still does not move,
check the remainder of the circuit as
described above.
Inlet manifold pre-heater temperature
switch - carburettor engines
10 The switch screwed into the underside of
the inlet manifold on carburettor engines
9.6 Coolant temperature gauge sender
unit