Rover 214 & 414 Service and Repair Manual - Rover club
Rover 214 & 414 Service and Repair Manual - Rover club
Rover 214 & 414 Service and Repair Manual - Rover club
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9.10 Inlet manifold pre-heater temperature<br />
switch (carburettor engines)<br />
controls the inlet manifold heater circuit (see<br />
illustration).<br />
11 The switch contacts should be closed to<br />
the ON position (ie: continuity should exist)<br />
only at temperatures below 50°C. Remove the<br />
switch <strong>and</strong> test it as described in paragraphs<br />
2 to 4.<br />
Thermostatically-operated vacuum<br />
switch - carburettor engines equipped<br />
with catalytic converters<br />
12 This switch is screwed into the thermostat<br />
housing.<br />
13 To test the switch, fit two suitable lengths<br />
of hose to the switch <strong>and</strong> suspend the switch<br />
in a pan of water which is being heated.<br />
Measure the temperature of the water<br />
with a thermometer. Do not let either the<br />
switch or the thermometer touch the pan<br />
itself.<br />
14 Blow down one of the hoses attached to<br />
the switch. The switch should be closed (ie:<br />
passes no air) when the water temperature is<br />
below 70°C. Above 70°C, the switch should<br />
open <strong>and</strong> air should flow freely through the<br />
hoses. Stop heating the water then allow the<br />
water to cool down <strong>and</strong> check that the switch<br />
closes at 70°C or just below.<br />
15 If the switch performance is significantly<br />
different from that specified, or if it does not<br />
work at all, then it must be renewed.<br />
Coolant temperature sensor - fuel<br />
injected engines<br />
16 This sensor, which is screwed into the<br />
underside of the inlet manifold (SPi engines),<br />
or located in the coolant pipe adjacent to the<br />
foward top edge of the timing belt cover (MPi<br />
engines), is a thermistor (see paragraph 6)<br />
which is supplied with approximately 5 volts<br />
by the engine management system ECU. The<br />
ECU also controls the sensor’s earth path<br />
<strong>and</strong>, by measuring the amount of current in<br />
the sensor circuit, determines the engine’s<br />
temperature. This information is used, in<br />
conjunction with other inputs, to control idle<br />
speed, injector opening time duration <strong>and</strong><br />
ignition timing.<br />
17 If the sensor circuit should fail to provide<br />
adequate information, the ECU’s back-up<br />
9.20 Remove cooling fan thermostatic<br />
switch <strong>and</strong> withdraw sealing ring<br />
(arrowed)<br />
facility assumes a value corresponding to<br />
60°C. The sensor itself can be tested only by<br />
having a <strong>Rover</strong> dealer check the complete<br />
system using the correct diagnostic<br />
equipment. Do not attempt to test the circuit<br />
using any other equipment, or the ECU will be<br />
damaged.<br />
Removal<br />
Cooling fan thermostatic switch<br />
18 With the engine <strong>and</strong> radiator cold, either<br />
drain the cooling system down to the level of<br />
the sender unit, or unscrew the expansion<br />
tank filler cap to release any remaining<br />
pressure <strong>and</strong> have a suitable plug ready that<br />
can be used to stop the escape of coolant<br />
while the switch is removed.<br />
19 Disconnect the battery negative lead.<br />
20 Disconnect the wiring connector from the<br />
switch then rotate the locking ring to release<br />
it. Withdraw the switch <strong>and</strong> sealing ring from<br />
the radiator (see illustration).<br />
Coolant temperature gauge sender<br />
unit<br />
21 With the engine <strong>and</strong> radiator cold, either<br />
drain the cooling system down to the level of<br />
the switch, or unscrew the expansion tank<br />
filler cap to release any remaining pressure<br />
<strong>and</strong> have a suitable plug ready that can be<br />
used to stop the escape of coolant while the<br />
unit is removed.<br />
22 Disconnect the battery negative lead.<br />
23 Disconnect the unit’s wiring connector<br />
<strong>and</strong> unscrew the unit from the coolant outlet<br />
elbow.<br />
Inlet manifold pre-heater temperature<br />
switch - carburettor engines<br />
24 Refer to Chapter 4.<br />
Thermostatically-operated vacuum<br />
switch - carburettor engines equipped<br />
with catalytic converters<br />
25 Refer to Chapter 5.<br />
Coolant temperature sensor - fuel<br />
injected engines<br />
26 Refer to Chapter 4.<br />
1689 <strong>Rover</strong> <strong>214</strong> & <strong>414</strong> Updated Version 09/97<br />
Cooling, heating <strong>and</strong> ventilation systems 3•7<br />
9.27 Cooling fan switch locking ring (A)<br />
thermostatic switch (B) <strong>and</strong> sealing<br />
ring (C)<br />
Refitting<br />
Cooling fan thermostatic switch<br />
27 On refitting, renew the sealing ring if it is<br />
worn or compressed <strong>and</strong> carefully clean the<br />
radiator seat before pressing in the<br />
sealing ring <strong>and</strong> switch (see illustration).<br />
Refit the locking ring <strong>and</strong> rotate it to<br />
tighten it securely. Reconnect the switch<br />
<strong>and</strong> battery, then replenish the cooling<br />
system.<br />
Coolant temperature gauge sender<br />
unit<br />
28 On refitting, apply a suitable sealant to the<br />
unit threads <strong>and</strong> tighten it to its specified<br />
torque wrench setting. Reconnect the unit<br />
<strong>and</strong> battery, then replenish the cooling<br />
system.<br />
Inlet manifold pre-heater temperature<br />
switch - carburettor engines<br />
29 Refer to Chapter 4.<br />
Thermostatically-operated vacuum<br />
switch - carburettor engines equipped<br />
with catalytic converters<br />
30 Refer to Chapter 5.<br />
Coolant temperature sensor - fuel<br />
injected engines<br />
31 Refer to Chapter 4.<br />
10 Heater components -<br />
removal <strong>and</strong> refitting 3<br />
Removal<br />
Heater unit<br />
1 Drain the cooling system.<br />
2 Working in the engine compartment,<br />
slacken the hose clips <strong>and</strong> disconnect the<br />
heater feed <strong>and</strong> return hoses from the matrix<br />
outlets on the bulkhead. Disconnect the cable<br />
inner from the heater valve <strong>and</strong> free the cable<br />
outer from its retaining clip. Slacken <strong>and</strong><br />
3