10psi should be good, I think the cap psi is 16-18????
On Feb 17, 2016 12:23 PM, "Michael McSwain" <michaelmcswain@gmail.com>
wrote:

> ​Any easy way to test for combustion gasses getting into the coolant?
>
> Loose or cracked heads would produce a leak or weeping from the head area I
> assume?
>
> Radiator should be easy enough to check for leaks, but heater core not so
> much.
>
> I've tried taking the expansion tank cap off after letting the van sit
> overnight and it still overflows when removed. Where I park it is slightly
> inclined with the front end up, but not much.  I'll try parking it front
> down tonight and try removing it again tomorrow morning.
>
> Is applying 10 or so psi of pressure to the expansion tank and looking for
> pressure drop and leaks a bad idea?  ​
>
>
>
> On Wed, Feb 17, 2016 at 1:01 PM, Dan N <dn92610@gmail.com> wrote:
>
> > I think it depends on how long you let the engine rest after you shut it
> > down. There always some residual pressure in the cooling system and it
> will
> > come near zero if you wait long enough... I let it sit overnight. My
> > mechanic revs the engine up to bring the level down, add the coolant and
> > put on the cap presto..
> >
>
>
>
> --
> m.
>