Chapter 3
Cooling, heating and ventilation systems
Antifreeze mixture . . . . . . . . . . . . . . . . . . . . . . . . . . . . .See Chapter 1
Coolant level check . . . . . . . . . . . . . . . . . . . . . .See “
Weekly checks”
Cooling system - draining, flushing and refilling . . . . . .See Chapter 1
General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Heater - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Heater controls - adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Heater controls - removal and refitting . . . . . . . . . . . . . . . . . . . . . . .10
Heater matrix - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . .12
Heater motor/fan - removal and refitting . . . . . . . . . . . . . . . . . . . . .13
Heating and ventilation system - description . . . . . . . . . . . . . . . . . . .8
Radiator - removal, inspection and refitting . . . . . . . . . . . . . . . . . . . .3
Radiator fan - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . .2
Radiator fan thermal switch - testing, removal and refitting . . . . . . .6
Temperature gauge sender unit - removal and refitting . . . . . . . . . . .7
Thermostat - removal, testing and refitting . . . . . . . . . . . . . . . . . . . .4
Water pump - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . .5
System type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pressurised, pump-assisted thermo-syphon with front mounted
radiator and electric cooling fan
Pressure cap rating
Up to 1986:
1.1 litre OHV engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.9 bar (13.0 lbf/in
2
)
1.3 and 1.6 litre CVH engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.85 to 1.1 bar (12.0 to 15.7 lbf/in
2
)
1986 onwards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.98 to 1.2 bar (14.2 to 17.0 lbf/in
2
)
Thermostat
Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Wax
Start to open temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85° to 89°C (189° to 192°F)
Fully open temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102°C (223°F) (±3°C/5°F for used thermostats)
Torque wrench settings Nm lbf ft
Radiator mounting bolts:
Pre-1986 models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 to 10 5 to 7
1986 models onwards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 to 27 15 to 20
Thermostat housing bolts:
OHV engines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 to 21 13 to 16
CVH engines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 to 12 7 to 9
Water pump bolts:
OHV engines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 to 10 5 to 7
CVH engines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 to 10 5 to 7
Water pump pulley (OHV engines) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 to 11 6 to 8
Fan shroud to radiator:
Pre-1986 models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 to 10 5 to 7
1986 models onwards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 to 5 2 to 4
Fan motor to shroud . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 to 12 7 to 9
3•1
Easy, suitable for
novice with little
experience
Fairly easy,
suitable for
beginner with
some experience
Fairly difficult,
suitable for
competent DIY
mechanic
Difficult, suitable
for experienced
DIY mechanic
Very difficult,
suitable for expert
DIY or professional
Degrees of difficulty
Specifications
Contents
3
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