Overheating problem 156 2.5 V6.

[CJLeeds]

Hi,
Travelling down M1 today at motorway speeds engine temp climbs all way into red. First time it has happened. Return home after stopping and fill water up to max (had been at that before only checked water 2 days before). Took car for another spin overheats again but water level is still at max and not leaking. Car was only serviced last week and unfortunately dont have a clue what to check for now! Fan cuts in aswell fine.

Thanks in advance for any help.

[CJLeeds]

I was worried it may be the head gasket but had a diagnostic on it today and it came back with no problems at all. Ill ask him to check the thermostat, thanks for that. No its just climbs as it normally would but if car is kept above 3000rpm for any time you can see the temp gauge climbing. Hopefully it is just the thermostat!

[CJLeeds]

Well, just picked it back up today after having a nightmare finding a new thermostat for it. Managed to get one from Alfa Dealer in Doncaster.

Now appears to be running absolutely perfect! Main test will come tomorrow when its gets a run down to Cambridge fingers crossed it was just the thermostat!

Thank you to everyone for your help. Was a big weight off my mind!