RW>Roger Nelson wrote to Roy Witt:   
      
   RW> RN> We finally found the valve to input some more freon this afternoon   
   RW> RN> and all it needed was a can.  Everything working well, now.   
      
   RW>How many pounds of pressure is that one can good for? One can brings my   
   RW>Z28 up to just over the minimum.   
      
   Did you read where they were mandating another Chjenge to the Refigerant   
   used in Automobiles. Some one decided that the R-134a was also polluting   
   too much and have come up with a revised formulation, HFO1234yf. GM   
   plans to start using it in soem of their 2013 Models. They thought about   
   using CO2 for a while but it requires verty high head pressures so it   
   was not selected. IT does make a nice refigerant though.   
      
   teh Refigerant is expensive, about $3000 for a 20 LB tank and it   
   requires a totaly NEW recharge and recovery unit for the shop at $2000   
   to $3000   
      
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