Paul,

I wish I had some fantastic idea for you, but my enthusiasm was dented
today, when another hose split, this time requiring putting Veronika on a
truck to the mechanics. It poured out quicker than I could replace it! I
guess I'm going to have to replace the entire system as a precaution. Oh
well, she needed servicing anyway.

What is the climate where you are?  I was wondering if excessive heat
might contribute to these problems? I have  regularly traveled all day in
temps over 100f. (with no overheating)  I wonder if  this causes fatigue
or stress over time.  This morning was frosty. May have something to do
with it?

Any theories anyone?

Take care + have fun,
Ian

Paul Cavanaugh wrote:

> Well, the mystery continues...
>
> My mechanic tested the coolant (while the engine was both hot and
> cold) for traces of combustion leakage (hydrocarbons in the cooling
> system) and found nothing.
>
> He also found no excessive pressure in the oooling system (I replaced
> the expansion tank pressure cap 2 weeks ago, just to be safe).
>
> No explanation for 4 rear heater cores and 2 differential coolers
> bursting in one year!
>
> He is suggesting it could this be an intermittent problem??? I don't
> want to lose another transmission!
>
> Any ideas from my Vanagon.com friends would be welcome.
>
> Thanks,
> Paul