Quote:
Originally Posted by S-Class Guru
Good plan. But if it's been down to zero for awhile, the receiver/drier should probably be changed.
A good plan might be to screw in the new switch in the old drier, vacuum the system (and wait a pretty good while, 2 hours or more to be sure).
Then if all looks good, pop the new drier on with the new switch, and do the vacuum again. After that charge her up, and add one can that has UV dye, just for furture leak detection ease.
Remember to research on the qty of 134 required. I'm pretty sure your system needs 46 oz (but double check me on that, the wife has the car today) of R12 so it should require maybe 32 oz or so of 134??
DG
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Thank you. I will certainly change the drier and switches as I mentioned previously. When the system was R12 it required 2.2 pounds of it. My system was retrofit to accept R134a and no label was affixed over the original factory R12 label. Another reason why I would rather do my own work. Anyway, being a novice, I didn't even bother checking for 134 connectors. It will switch it back to R12 later, but for now I want my a/c working.
I will change the pressure switch and pull the vacuum as you suggested. If all goes well I'll change the drier and charge the system after that. I'm using an a/c recharge/recovery unit, so I have to figure out how to get the oil and the dye into the system via that unit.