Just another thought, 

In addition to the many hoses that can leak more in the bitter cold perhaps the heads could be checked to see if they are still torqued fully. 

Eric Caron 
85 GL Auto 

> On Jan 23, 2020, at 1:09 PM, Dan N <dn92610@GMAIL.COM> wrote:
> 
> hi,
> 
> you may want to try one or two bottles of Subaru coolant conditioner. I use
> it and it's working good.
> 
> https://www.amazon.com/Subaru-OEM-Coolant-System-Conditioner/dp/B00WFI0W2Q
> 
> On Thu, Jan 23, 2020 at 10:00 AM Alfred Bagdan <abagdan@shaw.ca> wrote:
> 
>> We had some very cold weather the past 3 weeks,  -30 to -40 degrees,  and
>> there was an antifreeze leak from my 85 Vanagon.  This happens only in very
>> cold weather.  The expansion tank is empty but the coolant tank is about
>> half full.  I did not check the levels last fall when I parked the van for
>> the winter, so I'm not sure where it leaked out.  I can't see anything
>> dripping from under the van, but the antifreeze melted the snow and ice
>> under it.  The antifreeze is good to -40 deg.
>> 
>> Is it a bad idea to pour in some sealant and run the engine to try and fix
>> the leak?  If not what do you recommend?
>> 
>> 
>> 
>> Alfred
>> 
>> 85 Vanagon
>> 
>> Edmonton
>>