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Hi there and welcome! I've twigged what car your driving, 300C from the newbie section, but I'd suggest popping the question on the tech help section. I'd answer but I don't know for yours, on the GV you can get a stub shaft easily. Quite cheap.

Hiya! Definitely a good plan, and also give it the system a flush out with a hose pipe, i would do it just before you swap the rad personnally. There is a good method on the forum from Qinteq somwhere, as I had a petrol not totally familiar, but essentially hose in the header tank, engine running to pump it round, and bottom rad hose partly of for it to escape and rinse through the system. Before that though, as you say, check the rad fans run, but should not be relevant at 70mph.

It really is isn’t it!!! Something so insignificant can cause so many problems all at once lol