THis has happened on my GEX rebuild for the last 4 years.  Total usage
has been about 1/2 gallon over the winter.  Most people have this problem
who live in cold weather but do not notice it.  I've had several people
come to me asking about where the coolant is going, only to find
its only a winter, (cold weather) leak. I have slowed it down by jamming
a very strong and thin putty knife in between the gasket and the block.
This disturbs the corrosion enough to limit the leaks.  I do not recommend
this, unless you are ready to rebuild, because this could make the leak
worst.
                                                                ERic

Lee Kouns wrote:

>Has anyone else had the experience of getting head gasket leaks after
>moving to a colder climate? After spending all their lives in Southern
>California, both my 87 Westy (80,000 miles) and my 88 Westy (150,000
>miles) started seeping coolant at the head gaskets (on both sides of the
>engine) during the first winter we spent in Lake Tahoe. Nighttime temps
>were usually in the teens for 3-4 months. Do cold temps promote head
>gasket leaks?---especially with older gaskets?
>Can the metal of the engine contract enough in cold temps to cause the
>seepage?
>Just wondering,
>Lee
>
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