Troy, you stated:

>>...My fridge frequently does blow out at highway  speeds, and someone mentioned that a leak in the system was the culprit, but I  sure don't find any leaks. <<

   One reason for "blowing out syndrome" can be a poor seal between the opening in your van's side wall and the fridge vent bits.  After a few screwups, I've learned to carefully assemble the vent parts and to use a thick silicone tire shine product on the large rubber gasket- this apparently helps to insure a leak proof seal when all else fails.

George/ATL
'89 WesTiico, "Wernher"
'67 Kombi, "Puddles"