Fiat 1998 Marea Service Manual page 131

Engine
Removing- refitting radiator
10.
PROCEDURE FOR REFILLING ENGINE COOLING SYSTEM (version with air conditioning)
Total capacity of system: 4.45 litres
Method for draining the circuit
The system can, if necessary, be drained as follows:
1. Remove the cap from the expansion tank (3) and open the bleed screw (5) on the heater inlet hose
and the bleed screw (6) on the heater outlet hose.
2. Disconnect the coolant return pipe (11) from the radiator and recover the engine coolant which comes
out in a suitable container. When this operation is completed, restore the connection for the pipe (11)
with the radiator, using a new band.
Method for refilling the circuit
1. Check that the bleed screw (5) on the heater inlet hose and the bleed screw (6) on the heater outlet
hose are open.
2. Refill the system by slowly introducing coolant (a mixture of 50% water and paraflu) until coolant
comes out of the bleed screw (5) on the heater inlet hose and the bleed screw (6) on the coolant out-
let hose. Then close the bleed screws (5) and (6).
Complete the refilling until the MAX reference on th expansion tank (3) is reached. Then refit the cap
on the tank (3).
3. Working from inside the vehicle, set the maximum heating condition, turning the air temperature ad-
justment knob to the maximum temperature positino (red sector) and the fan speed adjustment knob to
the maximum ventilation position and switch the air conditioning OFF.
4. Start up the engine and let it idle for about 2-3 minutes. Partly (2-3 threads) open the bleed screw (6)
on the heater return hose in order to completely bleed the heater, slowly increase the engine speed until
coolant comes out of the above mentioned bleed screw, then close it again.
5. Then carry out gradual, periodic accelerations (about every 30 seconds) until 3/4 of the maximum
power speed is reached, at the same time introducing engine coolant into the expansion tank, but not
beyond the MAX level. During this operation, check the engine coolant temperature gauge and make
sure that hot air is coming out of the vents; if this is not the case, repeat the operations described in
point 4.
This operation should be carried out until the engine cooling fan comes on for the first time.
Let the engine idle for at least 5 minutes, then switch it off.
If necessary, top up until the level is between the MIN and MAX marks on the expansion tank. This op-
eration should be carried out after having left the engine too cool down so that the temperature of the
coolant is not above 25°C.
When the operation is completed, check that the quantity of fluid introduced is at least equal to that re-
covered when the system was drained.
NOTE //, during the operations described in point 5, the coolant should boil, the procedure should be
interrupted and repeated starting from the operation described in point 4.
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