how do you empty and refill your cooling system on your cosworth correctly? ever since my hose burst and i topped it up again im sure i have an airlock in there as the temps seem to have risen. also how much water do they take? any help would be greatly apreciated thanks. matt.

 

Theres a bleed screw on the housing just below your cam wheels,think it's a 10mm nut.

 

One of the best things you can do is to drill a 4mm hole in your stat, as this helps eliminate air locks when refilling.
Having just done my sapphy I would say they hold somewhere around 7/8 litres.
I wouldn't worry too much about operating temps especially if new stat, as old one may have been lazy, just let it get up to temp so fan cuts in, then leave overnight to cool down, it will draw out any air, make sure you leave the cap on all the time it is running, as there is no reason it need be off, and it needs to be there to help develope a vacuum that draws air out upon cooling.
tabetha