Basically on cold start up in morning I can hear what sounds like a belt or a bearing, seem to think its water pump bearing as when cars upto temp and running noise goes away. Also the bottle connected to the top of the radiator to the right. Mines empty. Is it supposed to be empty or have water/fluid in it? The temp reason in car sits just below half way as should expect it too show. Just abit cautious as I'm concerned. All help appreciated thanks!