I think that Mark is assuming that you have already done the main Bentley
procedure so that the system is pretty well filled and you have replaced the
pressure cap.  When things get warm, the system will pressurize enough to
push the remaining air out at the bleeder bolt when you crack it open,
assuming you have a good pressure cap.

Larry A.

On Mon, Oct 13, 2008 at 8:10 AM, Allan Streib <streib@cs.indiana.edu> wrote:

> "mdrillock" <mdrillock@cox.net> said:
>
> > You don't need to remove the bolt to get the air out. Once the engine is
> > running and warmed up the coolant expands and pressure builds in the
> > system with the cap relief valve set at about 15 psi.  If you then
> > loosen the radiator bleed bolt a turn the pressure in the system will
> > release out of the radiator bleed hole, pushing out air if any is there
> > or coolant if not.
>
> That makes sense; I'll give it a try.  The problem is doesn't that
> require a person at each end of the van, one to operate the bleed screw
> and one to keep the reservoir from getting empty?
>
> Allan
> --
> 1991 Vanagon GL
>