one thing you could do since condensing is the big issue with 134a is to take out condensor and using mag wheel cleaner[weak acid] clean all the black paint off the tubes and fins.this will give 25-30% improvement in efficiency.

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David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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