Hi So, heres the issue. Car is fine when cold, but as temp needle nears halfway point it begins to struggle after 1500rpm, then it just stops going beyond that like its hitting a rev limiter. At that point temp needle will go 3/4s of the way up, so I have to stop for a few minutes and it drops down for a while until it hits the same temperature and starts all over again. On advice of a man from the RAC we got a new EGR valve, and when that didnt work, local garage found fault codes and put in a new crank sensor, and a new fuel filter. Problem still persists and they admit they don't know what the cause is, and we could be facing a small fortune in labour costs for them to investigate. It was they who suggested using the internet first in the hope someone somewhere has had this problem too and solved it. There is no engine management light and no more fault codes. A second RAC guy suggested the engine (coolant) temp sensor, something I think I can change myself, but Im also worried its the turbo.