Fitting a new expansion tank

[WhyTwo]

Do I need to bleed the system once I've fitted a new expansion tank? I'm assuming not. I've also been told that I should run the car with the cap off to allow any air out of the system. Is that correct?

[Boatbuoy]

I've removed and refitted my expansion tank before without having to bleed the system I did it by draining down the system to just below the bottom fitting which is higher than the bleed taps on the water rails.

Regards,
Olly

[WhyTwo]

Cheers Olly, that was what I was planning. I seem to remember taking it off to replace the starter motor and I simply drained the tank and then topped it up when I put it back on

[Mad Mark]

I always run the engine while filling up the water. If i drain it completely i fill part way then start the engine then fill to the line. the running engine helps remove trapped air. It's always worked for me. But it's still always a good idea to check the bleed screw on top or the radiator.