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