Quote:
Originally Posted by lorainfurniture
My experience with mb Ac systems is that you should just charge it by weight and don't look at the gauges. My vague recollection of my 300e was that the pressures were high after about half the r12 was in. I just stuck to the scale and I had perfect Ac after.
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I was experiencing the same thing, except with propane. Then I said forget the propane something isn't right. So we put the r134 back in, but we were going based on the gauges and pressures were still high. My friend decided that we should stop because the pressures were too high on the high side. When I left his place the temp was about 110°F, so I ended up going to Wal-Mart after picking up my son and just decided to purchase 2 of the 505 gram cans of 134 and I just charged the system until it got cold. With the outside temp the way it was I pretty much had nothing to lose and damaging a compressor was the least of my worries as I would just buy a new one. Sure enough after emptying the first can, there was no change, then half way through the second can the temps dropped at the vent. I added nearly the entire second can, save for about 2 - 3 grams and now my ac is better than I can remember. My vent temps are well below 60°F, I'd say maybe 45°-50° at the vents. Of course this isn't nearly as cold as what I was getting with the propane when then system was working properly, but I will not revisit messing with my ac system until the fall. So, I am in agreement with Lorrainefurniture, ignore the gauges, matter of fact, ignore the weight to a certain extent and fill the system until you notice a change. Obviously the original system was designed for about 1000 grams of refrigerant so you don't want to go past that and not have any change, but I'd say give it a shot, especially since I'm sure the AZ heat is just as intense there as it is here. Good luck and let us know.