I know that the typical suggestion for those who want to retrofit to 134a is to get a parallel flow condenser in order to help cool the refrigerant more efficiently. My question is whether such a condenser could also help the cooling capacity of an otherwise stock system (w/ R12).

Living in South Texas, I need all the help I can get!!!!

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Current Mercedes
1979 maple yellow 240D 4-speed

Gone and fondly remembered:
1980 orient red 240D 4-speed

Gone and NOT fondly remembered:
1982 Chna Blue 300TD

Other car in the stable:
2013 VW Jetta Sportwagen TDI / 6-speed MT