hi Eric,

I would suggest adding 2 bottles of Subaru coolant conditioner to the
coolant... this is NOT a stop leak.

https://www.amazon.com/SUBARU-SOA635071-Coolant-System-Conditioner/dp/B00IGZP2UE

On Tue, Jul 9, 2024 at 3:21 AM Eric Caron <ericcaron96@comcast.net> wrote:

> Hi Andrew,
>
>         Thank you for posting this.  Both for the good info, and because I
> didn’t see John’s message on list or in my junk.
>
> I once had air build up in my 1.9 reservoir.  Dennis Haynes suggested we
> try to torque the heads before I did anything else.  That worked and the
> engine is still running today powering a friends now water cooled Bay
> window.
> But, this was some air in the reservoir not blowing off a cap!
>
> John, what 2.1 are you working on?
>
> Any updates on your tree loving 91?
>
> Eric Caron
>
>
>
> > On Jul 7, 2024, at 5:11 PM, Andrew Berg <andrew@BERGWEB.CA> wrote:
> >
> > If you're driving and this happens, immediately crank your rad bleed
> screw a little. If a lot of air hisses out before coolant, then you likely
> have a bad fire ring. You can confirm with a block test kit to check for
> combustion gas in coolant. Sadly I encountered this and an currently
> rebuilding my engine.
> >
> > Andrew
> >
> > On Sun, Jul 7, 2024, at 4:52 PM, John Rodgers wrote:
> >> When the pressure cap blows off the coolant tank and coolant is lost,
> sure
> >> sign of blown gasket, Right? 2.1 L
>