if there is no refigerant in my nissan altima 2004 does the system have to be evacuated
Yes it should be evacuated, but you first need to find and fix the leak, because if you don't fix the leak you will never get the system into a vacuum...
Yes, it is vital that all the moisture is removed and that is what an evacuation does, plus if you do have any leaks it won't hold any vacuum very long, so if that happens the leaks will have the be fixed before the system can be recharged.
Dye needs to be put into the system so that you can find the leak.
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