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Subject:Re: AC convert
From:Roger Sisler
Date:Mon, 17 Apr 2006 15:28:42 -0400
134a works at pressures about 20 percent higher than r-12. Look for about
250 psi high side,I believe. Did you put enough 134a in? I hear that folks
who convert to 134a say that it will work ok most times.That expansion
valve is origional? It is a r-12 valve. Swap it for a 134a valve.A
refrigerant(besides r-12) that works at r-12 pressures let  you keep the
valve.