I have a 2004 Vogue and had a new radiator fitted six months ago. About a month later the temperature gauge started to creep up and got worse every day. The mechanic who fitted the radiator bled the system again and it was fine for another couple of months then the needle started rising again so had the system bled again. No leaks to be found. Two months on and it’s started again but much quicker this time with no back to normal at any point. Anybody had anything similar or any suggestions as to what might be the problem? Cheers.