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so the expansion valve failure caused excessive pressure in the system which subsequently damaged the evaporator core? any idea what the symptoms are when the expansion valve failure? I'd bet it would be much cheaper and easier to replace the expansion valve. Thanks....

The main reason why failed was the expansion valve and there was a big leak on the old core, here in my country instead of buying the original part the mechanics try to fit another similar. So I don't think the original could failed that easily, with good maintenance it should last the car's life
 
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