CD changer OPEL CALIBRA 1988 Service Repair Manual

level in the expansion tank, and top-up if
necessary. Note that the system must be cold
before an accurate level is indicated in the
expansion tank. If the expansion tank cap is
removed while the engine is still warm, cover
the cap with a thick cloth and unscrew the
cap slowly, to gradually relieve the system
pressure. Take care to avoid scalding by
steam or coolant escaping from the
pressurised system.
9On DOHC models, refit the engine
undershield on completion.
5Coolant mixture -general
1It is important to use an antifreeze mixture
in the cooling system all year round, to
prevent corrosion of the alloy engine
components. The coolant mixture should be
made up from clean, preferably soft, tap
water, and a good quality antifreeze
containing corrosion inhibitor. Ensure that the
antifreeze is ethylene glycol based, as the
cheaper methanol based types evaporate
over a period of time.
2The proportions of water and antifreeze
used will depend on the degree of protection
required. A coolant mixture containing 25%
antifreeze should be regarded as the
minimum strength required to maintain good
anti-corrosion properties. Details of the
degree of protection provided against freezing
will be supplied with the antifreeze by the
manufacturers. For absolute protection, use a
50% antifreeze mixture.
3The coolant mixture should be renewed
every two years, as the corrosion inhibitors
will deteriorate with time.
4Before filling the system with fresh coolant,
drain and flush the system, as described in
Sections 2 and 3, and check that all hoses are
secure and that the clips are tight. Antifreeze
has a searching action, and will leak morerapidly than plain water.
5Refill the system as described in Section 4.
All future topping-up should be carried out
using a coolant mixture of the same
proportions as that used to initially fill the
system.
6Do not use antifreeze in the windscreen
wash system, as it will attack the vehicle
paintwork. Note that antifreeze is poisonous,
and must be handled with due care.
6Radiator (manual
transmission) -removal and
refitting
3
Removal
1The radiator can be removed complete with
the coolant fan and shroud if there is no need
to disturb the fan. If desired, the fan and its
shroud can be removed from the radiator,
with reference to Section 12.
2Drain the cooling system, as described in
Section 2.
3Disconnect the radiator top hose and the
expansion tank at the radiator.
4Disconnect the battery negative lead, then
disconnect the wiring from the cooling fan
switch, located at the bottom right-hand side
of the radiator.5Disconnect the cooling fan wiring
connector, noting its location for use when
refitting.
6Compress and remove the two radiator
securing clips, located at the top corners of
the radiator (see illustration).
7Pull the top of the radiator back towards the
engine to free it from the top mountings, then
lift the radiator to disengage the lower
securing lugs. Move the radiator clear of the
vehicle, taking care not to damage the cooling
fins (see illustrations).
Refitting
8The radiator can be inspected and cleaned
as described in Section 8.
9Refitting is a reversal of removal, bearing in
mind the following points.
10Ensure that the radiator rubber mountings
are in good condition and renew if necessary,
and ensure that the lower securing lugs
engage correctly as the radiator is refitted.
11Refill the cooling system, (Section 4).
7Radiator (automatic
transmission) -removal and
refitting
3
Removal
1On models with automatic transmission,
the radiator left-hand side tank incorporates a
heat exchanger to cool the transmission fluid.
It is connected to the transmission by a pair of
flexible hoses, with a metal pipe at each end.
2When removing the radiator, either clamp
the transmission fluid cooler flexible hoses, or
slacken their clamps, work them off their
unions and swiftly plug or cap each hose end
and union to minimise the loss of fluid and to
prevent the entry of dirt.
Refitting
3On refitting, reverse the removal procedure
and do not forget to check the transmission
fluid level, topping-up as necessary to replace
the lost fluid, as described in Chapter 7B.
Cooling, heating and ventilation systems 3•3
6.7B Withdrawing the radiator -
2.0 litre SOHC model6.7A Radiator freed from top right-hand mounting -
1.6 litre model
6.6 Compressing a radiator securing clip -
2.0 litre SOHC model
3