Fiat Stilo losing water

If you can't see where you are losing water from , a pressure test will show any external leaks and a sniff test ( block test ) will tell you if head gasket leaking .It all depends where head gasket leaks whether you get oil / water mixing or not .If cooling system not pressurising , could be something minor .

could be something simple like a radiator leak. check around area for a leak and pipes to radiator. if radiator is leaking get a bottle of rad weld or something that will seal leak.

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ive checked it again this morning,i havent lost any water but have noticed the expansion bottle is really hot after a 2 mile drive,could this tell you anything further ?

hi maybe a coolant temperature sencer fault. have you checked radiator for leaks??