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the 134a valve works fine with r12 you will not notice any diff.i would not install that evap make them replace it.btw i looked at the pics of the old evap and can see where the epoxy dissappeared where the copper fits into the aluminum.benz did not know that long term the 134a would compromise the epoxy[neither did anyone else]but they knew that aluminum would transfer heat much better than copper and was half the weight.
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