I'd suggest you to put in the coolant one or two bottles of Subaru Coolant
Conditioner. You can find it in any auto part store.

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

On Thu, Dec 21, 2023 at 10:33 AM David McNeely <davmcneely40@gmail.com>
wrote:

> I have seen no relationship between leaks and cold weather.  I lived in
> Oklahoma for the first five years I had the camper.  Up and down
> temperatures, but typically below freezing at night, above in the day in
> winter, which I suspect is the case in western NC most winters.  Now I live
> in eastern Washington.  Cold all winter, but I haven't seen that happen in
> early fall either, when nighttime freezing, daytime warming is typical.
>
> On Thu, Dec 21, 2023 at 10:00 AM Jamie Auch <jamie@kookymathteacher.com>
> wrote:
>
> > Dear List,
> > I have a 1989 Blue Star with a 2.1. Three nights ago the temps dipped
> > below 30 F. in Western North Carolina. The next morning, I had
> > A puddle of coolant in the drivers side rear of the Vanagon. The next
> > night, I was working in the garage and left the BlueStar in the garage.
> > There was no puddle Yesterday.
> > Once again, I left the Vanagon outside and found a larger puddle this
> > morning. To my cold weather list members, is this a recurring problem?
> What
> > should
> > I look to do to fix the problem. Thanks.
> > Jamie Auch
> > The Kooky Math Teacher
> >
> >
> > Sent from my iPhone
>