Re: what am i doing wrong
I just normaly read the posts but when an a/c question comes up I will jump in. If you do not pull a complete vacuum on the system you will not get all of the moisture out, Also the vacuum will get all the air out. The air contains nitrogen which is a non compressable gas, with the nitrogen in the system it will heat up cause a higher than normal head pressure and it might work for a time but it will quit. here in Houston, Texas you can rent a vacuum pump from AutoZone. I have repaired many a/c's here and pulling the system down is key. PM me if you have any questions
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