Cinquecento/Seicento Service your cinquecento WIP

okay with a cold engine,unscrew the expansion tank cap.start slowly to allow the pressure to escape gradually.
undo the lower radiator hose,if this has a factory fit clip then if find it easiest to snap these off with a screwdriver and replace with a standard jubilee/worm drive clip.
remove the hose and allow coolant to drain.
look under the coil packs on the roght of the engine(looking from the front) and you will see a hose entering the engine block.undo the clip on this hose and remove.
this gives you access to the thermostat.undo the 2 10mm bolts and withdraw the thermostat housing.

okay now flushing.i will break this into two parts.
radiator flushing
disconnect the radiator top hose and either insert a hose or a funnel if you have no access to a hose supply.
now run or pour fresh water through the radiator till it runs clear from the bottom.
reconnect the top hose
engine flushing
same as before but you are flushing water in via the radiator bottom hose and flushing.
now for a seicento make sure the heater is on the hot setting to allow water to flush the matrix out.
once all flushed out refit the thermostat and hoses. now personally i would generally just replace the thermostat as a matter of course if im doing a coolant change but its down to you.
note on the sporting a new thermostat gasket is required

filling:
its best practice to premix the antifreeze/water to the correct ratio before adding to the cooling system.
so before adding coolant ensure all clips are tight and all hoses are in good condition.
its easier to use a funnel to fill the coolant.
place it in the expansion tank ,open the 2 bleed screws(one on the bulkhead by the battery and one on the inner wing by the radiator side)and add coolant until it starts to emerge from the bleed screws.
tighten the bleed screws.
top up the coolant to the MAX level
start the engine and allow the coolant to reach temperature(fan cuts in and out)but watch coolant levels dont go to low and motitor for leaks.
stop the engine,allow it to cool and recheck coolant levels and top up if required.