Coolant overflow tank

["Harvey, Cole E" <cole.harvey@baesystems.com>]

Hi all,

I read some past posting about coolant overflow tanks, and made one for my
SII.  It is just a bottle with a hose that extends to its bottom with the
other end connected to the pressure valve on the header tank.  I ran the car
and the bottle filled up, but as the car cooled the coolant did not return
to the header tank.  Am I expecting too much here?  Is my pressure valve not
functioning correctly?  I was thinking that the coolant should be sucked
back into the header tank.

Thanks, Cole