oh and also. the system was made for r12. and every little gasket and o ring that r12 passes over is made to withstand that particular chemical. if all they did was suck down the system. change you over to the 134 oil and gas. that 134 oil can react VERY badly with those orings and whatnot that have had the r12 oil on them. and soaking into them for 15 years. the 134 oil will literaly eat every part of the system that is made to seal.
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