Techs suggest evacuating and recharging systems sometimes as a first step in solving the ac not cold complaint. (after making sure the compressor is coming on and other basic stuff) Easy to do, hook up and program the machine, they can bill time working on another car during the evac and recharge, come back 45 minutes later, and it's cold/fixed. On some cars a few ounces over or undercharged and the system will not cool properly. Also, poor charging methods get air introduced into the system sometimes, which even if the proper weight of refrigerant is installed the system, it still won't blow cold air. You are correct - freon does not go bad, but it does get contaminated and the charging stations extract, clean and recycle the freon. The customer usually ends up buying "new" freon even if your system was full. Got to pay for the ~$5000 ac machine
There was not a recall on the noisy hose - customer had to complain (during the warranty period) for it to be replaced.
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