Quote:
Originally Posted by robinbanks
Basically just before the evaporator (under the dash) there is a component that restricts the flow of liquid refrigerant, after this the refrigerant is released into a larger area to drop the pressure. This is where the cooling process happens, I would be very surprised if this process could ever be totally silent, certainly when you first start the a/c
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I don’t remember hearing this hissing sound though until before a few weeks ago?