I did not replace any components. the end of last summer my ac stopped working right so i got a can of 134a and put it in and it kinda worked but is not as cool as it was so I am planning on pulling a vacuum on the system and checking for leaks and filling it back up if it checks out. I assume all the oil comes out when i put the vacuum pump on ?
Unless you are replacing a component, the oil should mostly stay in the system. GM says to keep track of how much came out when you pull a vacuum and to replace the same amount. In my experience of pulling a vacuum on two different cars (a Saturn and a Jeep), very very little (if any) usually comes out.
_________________ 2001 Galaxy Silver 9C1 w/ L67 and 4T65E-HD...and a few other mods.
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