
Chapter 3
Cooling, heating and ventilation systems
Air conditioning system - component renewal  . . . . . . . . . . . . . . . . .22
Cooling fan switch - removal and refitting  . . . . . . . . . . . . . . . . . . . .16
Cooling system - draining  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Cooling system - filling  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Cooling system - flushing  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Electric cooling fan(s) - removal and refitting  . . . . . . . . . . . . . . . . . .10 
Expansion tank - removal and refitting . . . . . . . . . . . . . . . . . . . . . . .14
General information and precautions  . . . . . . . . . . . . . . . . . . . . . . . . .1
Heater assembly - removal and refitting  . . . . . . . . . . . . . . . . . . . . .19
Heater control cables - removal and refitting  . . . . . . . . . . . . . . . . . .18
Heater controls - removal and refitting . . . . . . . . . . . . . . . . . . . . . . .17
Heater coolant valve - removal and refitting  . . . . . . . . . . . . . . . . . .21Heater matrix - dismantling and reassembly  . . . . . . . . . . . . . . . . . .20
Radiator - inspection and repair  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Radiator - removal and refitting  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Temperature gauge sender - removal and refitting  . . . . . . . . . . . . .15
Thermostat - removal and refitting  . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Thermostat - testing  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Viscous-coupled fan - removal and refitting  . . . . . . . . . . . . . . . . . . .9
Water pump/alternator drivebelt(s) - inspection, renewal and
adjustment  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Water pump/alternator drivebelt tensioner - removal and refitting  .13 
Water pump - removal and refitting  . . . . . . . . . . . . . . . . . . . . . . . . .11
General
System type  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sealed, pressurised, thermostatically controlled
Fan type  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mechanical temperature-sensitive viscous clutch, or electric
(DOHC)
Coolant
Type  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See “Lubricants and fluids”
Capacity:
SOHC  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.0 litres (14.1 pints) approx
DOHC:
Carburettor models  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.9 litres (13.9 pints) approx
Fuel injection models  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.3 litres (12.8 pints) approx
V6  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.5 litres (15.0 pints) approx
Specific gravity at 45 to 50% antifreeze concentration  . . . . . . . . . . . . . 1.069 to 1.077
Expansion tank cap
Opening pressure:
SOHC and V6  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.85 to 1.10 bar
DOHC  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0 to 1.4 bar
Thermostat
Nominal rating:.
SOHC  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88°C (190°F)
DOHC  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102°C (216°F)
V6  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82°C (180°F)
Actual opening temperature:
SOHC and DOHC  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85° to 89°C (185° to 192°F)
V6  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79° to 83°C (174° to 181°F)
Water pump drivebelt
Deflection  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mm (0.4 in) approx under normal fingertip pressure at mid-
point of longest run
3•1
Easy,suitable for
novice with little
experienceFairly easy,suitable
for beginner with
some experienceFairly difficult,
suitable for competent
DIY mechanicDifficult,suitable for
experienced  DIY
mechanicVery difficult,
suitable for expert
DIY or  professional
Degrees of difficulty
Specifications Contents
3
procarmanuals.com 

Chapter 4
Fuel and exhaust systems
Air cleaner and element - removal and refitting  . . . . . . . . . . . . . . . . .2
Air cleaner temperature control - description and testing  . . . . . . . . .3
Carbon canister - removal and refitting  . . . . . . . . . . . . . . . . . . . . . .44
Carbon canister purge solenoid - removal and refitting . . . . . . . . . .45 
Exhaust gas oxygen (HEGO) sensor - removal and refitting  . . . . . .43
Exhaust manifold(s) - removal and refitting  . . . . . . . . . . . . . . . . . . .41
Exhaust system - inspection, repair and renewal  . . . . . . . . . . . . . .42
Fuel cut-off inertia switch - removal and refitting . . . . . . . . . . . . . . . .7
Fuel filter - renewal  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Fuel gauge sender unit - removal and refitting . . . . . . . . . . . . . . . . . .6
Fuel-injection system - depressurisation  . . . . . . . . . . . . . . . . . . . . .28
Fuel-injection system - idle speed and mixture adjustments . . . . . .31
Fuel-injection system relays - location  . . . . . . . . . . . . . . . . . . . . . . .29
Fuel-injectors - removal and refitting  . . . . . . . . . . . . . . . . . . . . . . . .36
Fuel pressure regulator - removal and refitting  . . . . . . . . . . . . . . . .37
Fuel pump - testing, removal and refitting  . . . . . . . . . . . . . . . . . . . . .4
Fuel rail temperature switch - removal and refitting  . . . . . . . . . . . . .39
Fuel tank - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
General information and precautions  . . . . . . . . . . . . . . . . . . . . . . . . .1
Idle speed control valve - removal and refitting  . . . . . . . . . . . . . . . .34
Inlet manifold - removal and refitting  . . . . . . . . . . . . . . . . . . . . . . . .40
Mixture adjustment potentiometer - removal and refitting  . . . . . . . .38
Pierburg 2V carburettor - dismantling and reassembly  . . . . . . . . . .13
Pierburg 2V carburettor - fast idle adjustment  . . . . . . . . . . . . . . . . .14
Pierburg 2V carburettor - idle speed and mixture adjustments  . . . .11
Pierburg 2V carburettor - removal and refitting  . . . . . . . . . . . . . . . .12Throttle body - removal and refitting  . . . . . . . . . . . . . . . . . . . . . . . .33
Throttle cable - removal and refitting  . . . . . . . . . . . . . . . . . . . . . . . . .9
Throttle pedal - removal and refitting  . . . . . . . . . . . . . . . . . . . . . . . . .8
Throttle position sensor - removal and refitting  . . . . . . . . . . . . . . . .32
Unleaded fuel - general  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Vane airflow meter(s) - removal and refitting  . . . . . . . . . . . . . . . . . .35
Vapour separator - removal and refitting  . . . . . . . . . . . . . . . . . . . . .10
Weber 2V carburettor - automatic choke adjustment  . . . . . . . . . . .18
Weber 2V carburettor - dismantling and reassembly . . . . . . . . . . . .17
Weber 2V carburettor - idle speed and mixture adjustments  . . . . .15
Weber 2V carburettor - removal and refitting . . . . . . . . . . . . . . . . . .16
Weber 2V TLD carburettor - automatic choke unit removal,
refitting and adjustment  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Weber 2V TLD carburettor - accelerator pump diapragm renewal  .25
Weber 2V TLD carburettor - idle speed and mixture adjustments . .19
Weber 2V TLD carburettor - low vacuum enrichment
diaphragm renewal  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Weber 2V TLD carburettor - needle valve and float removal,
refitting and adjustment  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Weber 2V TLD carburettor - power valve diaphragm renewal  . . . . .23
Weber 2V TLD carburettor - removal and refitting   . . . . . . . . . . . . .20
Weber 2V TLD carburettor - secondary throttle valve vacuum
diaphragm renewal  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Weber 2V TLD carburettor - throttle kicker removal, refitting
and adjustment  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
General
System type:
1.8 litre  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Twin choke Pierburg carburettor
2.0 litre carburettor:
SOHC  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Twin choke Weber 2V carburettor
DOHC   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Twin choke Weber 2V TLD carburettor
All models with fuel injection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Multi-point fuel-injection system controlled by EEC IV engine
management system
Fuel tank capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 litres (15.4 gallons) approx
Fuel grade*:
Leaded  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 octane RON (UK 4-star)
Unleaded  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 octane RON (Premium)
* Models fitted with a catalytic converter must be operated on unleaded fuel at all times. Do notuse leaded fuel as the catalyst will be destroyed.
Idle speed:
1.8 litre  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 800 ± 20 rpm
2.0 litre carburettor:
SOHC*  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 800 or 875 rpm
DOHC:
Manual gearbox*  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 850 ± 25 rpm
Automatic transmission*  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 875 ± 25 rpm
2.0 litre fuel-injection:
SOHC*  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 800 or 875 rpm
DOHC* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 875 ± 50 rpm
4•1
Easy,suitable for
novice with little
experienceFairly easy,suitable
for beginner with
some experienceFairly difficult,
suitable for competent
DIY mechanicDifficult,suitable for
experienced  DIY
mechanicVery difficult,
suitable for expert
DIY or  professional
Degrees of difficulty
Specifications Contents
4
procarmanuals.com 

Fuel and exhaust systems  4•3
4
Weber 2V TLD carburettorPrimarySecondary
Venturi diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23.0 mm25.0 mm
Main jet:
Manual gearbox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115157
Automatic transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .112157
Air correction jet:
Manual gearbox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .175145
Automatic transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .210145
Emulsion tube:
Manual gearbox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .F114F3
Automatic transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .210145
Fast idle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1800 ±50 rpm
Float level (with gasket) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29.0 ±0.5 mm
Automatic choke vacuum pull-down . . . . . . . . . . . . . . . . . . . . . . . . . . .5.0 ±0.5 mm
Throttle kicker speed (see text):
Manual gearbox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2000 ±50 rpm
Automatic transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2200 ±50 rpm
Fuel-injection system
Make . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Bosch
Fuel pump type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Roller cell, electric
Fuel pump output pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Greater than 5 bar at 12 volts, no flow
System control pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.5 bar
Torque wrench settingsNmlbf ft
Inlet manifold:
SOHC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 to 2113 to 16
DOHC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 to 2415 to 18
V6:
Stage 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 to 83 to 6
Stage 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 to 156 to 11
Stage 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 to 2111 to 16
Stage 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 to 2516 to 18
Stage 5 (after warm-up) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 to 2516 to 18
Exhaust manifold:
OHC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 to 2516 to 18
V6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 to 3018 to 22
Plenum chamber to inlet manifold:
2.8 litre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 to 105 to 7
2.4 & 2.9 litre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 to 2515 to 18
Carburettor bolts (DOHC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 to 106 to 7
Fuel pump bolts (mechanical pump) . . . . . . . . . . . . . . . . . . . . . . . . . . .14 to 1810 to 13
Fuel pipe to fuel-injection pressure regulator:
SOHC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 to 2011 to 15
2.8 litre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 to 127 to 9
Pressure regulator base nut/bolt:
SOHC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 to 2515 to 18
DOHC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 to 127 to 9
V6:
2.8 litre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 to 2011 to 15
2.4 & 2.9 litre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 to 117 to 8
Fuel rail bolts:
SOHC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 to 117 to 8
DOHC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 to 2615 to 19
Exhaust downpipe flange nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35 to 4026 to 30
Exhaust clamps and U-bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38 to 4528 to 33
Exhaust gas oxygen sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50 to 7037 to 52
Throttle body bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 to 117 to 8
Idle speed control valve bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 to 117 to 8
Fuel filter unions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 to 2010 to 15
Fuel rail temperature sensor (DOHC) . . . . . . . . . . . . . . . . . . . . . . . . . . .8 to 116 to 8
Fuel rail temperature switch (2.4 & 2.9 litre) . . . . . . . . . . . . . . . . . . . . . .20 to 2515 to 18
HEGO sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50 to 7037 to 52
All models are fitted with a rear-mounted fuel
tank. Fuel is conveyed from the tank by a
mechanical or electrical fuel pump, according tomodel and equipment, to the carburettor or fuel-
injection system. The delivery capacity of the
fuel pump exceeds the maximum demands of
the system, so excess fuel is constantly returned
to the tank. This helps to avoid the problems of
vapour locks in the fuel lines.
Carburettor models have a twin venturidowndraught carburettor of Pierburg
manufacture on 1.8 litre models and Weber on
2.0 litre models. Both makes of carburettor
have an automatic choke.
Fuel-injection, when fitted, is of the Bosch
L-Jetronic type. This system is under the
control of the EEC IV module.
1General information and
precautions
procarmanuals.com