Warning: Walt until the engine of Fiat Punto is cold before starting this procedure. Do not allow antifreeze to come In contact with your skin, or with the painted surfaces of the vehicle. Rinse off spills immediately with plenty of water. Never leave antifreeze tying around in an open container, or in a puddle in the driveway or on the garage floor. Children and pets are attracted by its sweet smell, but antifreeze can be fatal if ingested.

Cooling system of Fiat Punto draining
1 With the engine completely cold, cover the expansion tank cap with a wad of rag, and slowly turn the cap anti-clockwise to relieve the pressure in the cooling system (a hissing sound will normally be heard). Wait until any pressure remaining in the system is released, then continue to turn the cap until it can be removed.
2 Position a suitable container beneath the radiator bottom hose connection, then release the retaining clip and ease the hose from the radiator stub. If the hose joint has not been disturbed for some time, it will be necessary to gently manipulate the hose to break the joint. Do not use excessive force, or the radiator stub could be damaged. Allow the coolant to drain into the container.
3 The cooling system of Fiat Punto bleed screws should be opened to aid the draining process and help prevent airlocks. These are located on the top left-hand edge of the radiator, and on the heater inlet hose (see illustrations), if the coolant has been drained for a reason other than renewal, then provided it is clean and less than two years old, it can be re-used, though this is not recommended.



Cooling system bleed screws located on the radiator (arrowed)...



... and heater inlet hose (arrowed)



4 Once all the coolant has drained, reconnect the hose to the radiator of Fiat Punto and secure it in position with the retaining clip.

Cooling system flushing
5 If coolant renewal has been neglected, or if the antifreeze mixture has become diluted, then in time, the cooling system may gradually lose efficiency, as the coolant passages become restricted due to rust, scale deposits, and other sediment. The cooling system efficiency can be restored by flushing the system clean.
8 The radiator should be flushed independently of the engine, to avoid contamination.

Radiator flushing
7 To flush the radiator of Fiat Punto disconnect the top and bottom hoses and any other relevant hoses from the radiator.
8 Insert a garden hose into the radiator top inlet. Direct a flow of clean water through the radiator, and continue flushing until clean water emerges from the radiator bottom outlet.
9 If after a reasonable period, the water still does not run clear, the radiator can be flushed with a good proprietary cooling system cleaning agent. It is important that their manufacturer's instructions are followed carefully. If the contamination is particularly bad, insert the hose in the radiator bottom outlet, and reverse-flush the radiator.

Engine flushing
10 To flush the engine of Fiat Punto, remove the thermostat housing.
11 With the top and bottom hoses disconnected from the radiator, insert a garden hose into the radiator bottom hose. Direct a clean flow of water through the engine, and continue flushing until clean water emerges from the thermostat housing opening in the cylinder head.
12 On completion of flushing, refit the thermostat housing and reconnect the hoses.

Cooling system filling
13 Before attempting to fill the cooling system of Fiat Punto, make sure that all hoses and clips are in good condition, and that the clips are tight. Note that an antifreeze mixture must be used all year round, to prevent corrosion of the engine components (see below).
14 Remove the expansion tank filler cap, and fill the system by slowly pouring the coolant into the expansion tank to prevent airlocks from forming. Ensure that all bleed screws are open.
15 If the coolant is being renewed, begin by pouring in a couple of litres of water, followed by the correct quantity of antifreeze, then top-up with more water. Periodically squeeze the radiator top and bottom hoses to help expel any trapped air in the system.
16 Continue adding coolant until it is seen to emerge from the bleed screws. Close each bleed screw in turn as the coolant emerges.
17 Top-up the coolant level to the MAX mark and refit the expansion tank cap. Ensure that all bleed screws are closed.
18 Start the engine of Fiat Punto and run it at idling speed for two to three minutes. Allow the engine to continue running until the electric cooling fan operates, but during this time periodically increase the engine speed gradually to 2000 to 3000 rpm.
19 Stop the engine and allow it to cool down completely.
20 Check for leaks, particularly around disturbed components. Check the coolant 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.

Antifreeze mixture
21 The antifreeze in Fiat Punto should always be renewed at the specified intervals. This is necessary not only to maintain the antifreeze properties, but also to prevent corrosion which would otherwise occur as the corrosion inhibitors become progressively less effective.
22 Always use a monoethylene-glycol based antifreeze of the specified type. The quantity of antifreeze and levels of protection are indicated in the Specifications.
23 Before adding antifreeze, the cooling system of Fiat Punto should be completely drained, preferably flushed, and all hoses checked for condition and security.
24 After filling with antifreeze, a label should be attached to the expansion tank, stating the type and concentration of antifreeze used, and the date installed. Any subsequent topping-up should be made with the same type and concentration of antifreeze.
25 Do not use engine antifreeze in the windscreen/tailgate washer system, as it will cause damage to the vehicle paintwork. A screenwash additive should be added to the washer system in the quantities stated on the bottle.