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Just a little word of advice,do not keep using tyre valve dust caps as they may look similar but they do not seal efficiently,I know from experience!!. For peace of mind buy the proper cap at about 20p.hope you resolve your problem soon

A few years ago a similar thing happened with our Xsara. Not very time it was driven - only sometimes but there was no loss of coolant I swopped the sender unit in the end of the cylinder head and all was well there after.

For now, you still have to assume the temp is right due to possible damage if ignored. I would still check if any more air can be bled out, following Haynes, and that the level in the expansion tank is ok. Our C3 was difficult to get the air out, I did not have a header tank when refilling with anti freeze but jacked up the front right corner of the car so the cylinder head and cabin heater bleed screws were at a high point but lower than the water level in the expansion tank to help get the air out. Next suspect the thermostat, usually only a few £ for a new one and they do not last forever, although ones I have replaced before were opening early so the engine did not warm up. If you have the 90 or 110hp 2.0 hdi, the Citroen parts diagrams show a thermostat without the housing, opening at 83°C. Seems to be the mark 2 C5 that is part of the housing. Then it could be the sensor - it is worth checking the wires to it are ok and the connector is clean anyway. If you had a code reader that showed live data, you could see the indicated temps from the sensor and see if they were as expected. Need to beware though if buying one, on diesels not all readers may work until model year 2004. I would also check the water pump is not leaking - there were also on VW cars I think that had plastic impellers that fail, but I do not know about Citroen ones or whether the impeller can become loose. If the head gasket had failed from the first time, there could be coolant loss seen as steam in the exhaust but then the expansion tank level would fall - had this on a petrol car once. On a similar note, on our C3 on 2 occasions a year apart on the same journey (M62) that suddenly went to max temp, nothing obvious was found and later I replaced the anti freeze, thermostat and water pump as part of a timing belt change and it has not happened since. The old thermostat on testing opened at the right temp so may not have been at fault. When it did happen, first time I stopped, second time slowing down and putting the cabin heater on max brought the temp down on the gauge.

cheers mate, most insurance is a rip off. Always said if you have to have insurance by law, then it should be run by the government, like road tax. Would put a stop to legalised scam system in place now :blink: