OK folks, want to know why VOVs blow out??? Its because they get installed on DIRTY AC systems that should have been flushed and had filters installed after a compressor failure , but instead get just poked in because some folks seem to think that the orifice tube IS a filter. It might have been done 10 years before you got the truck, but any signs of a dirty system is cause for a full flush and filters
I have NEVER had a single one of my installations fail with them , and I've been putting those suckers in for a long time. When all else fails, follow instructions.
The VOV was invented by the very same person who invented the fixed orifice tube for the first clutch cycling orifice tube system He did it to correct the problems inherrent with the original fixed orifice tube system, and he did a bang up job., but like all modifications, they take some skill to work with. Once installed all standard pressure charts go to the four winds and you just have to feel the the charge in. and enjoy the cold