My air conditioning nightmare.2000 Grand caravan

So had the AC recharged this spring. I knew it needed it,wasnt working so good. 2 weeks later the AC is kaput again. So I had the system gone over by a very reputable mechanic,had to wait 2 weeks just to get in. Rear evap is cracked. Cost me about $740 yeasterday and it still wasnt right. The low side psi was to high (60 psi).Compressor is bad too.

Got a compressor at a VERY good price. The reputable mech was too busy and I wanted the AC fixed NOW dammit. I cant take 40 degree celsius weather due to my M.S.
So I take it to another place. Go to pick it up and they tell me theres more problems. Vans on the hoist and they show me oil all over the rear AC lines. But I know that this is from the rear evap cracking as the good mech said it had puked all over the place. He just didnt clean it up to save me a few bucks I guess. Theres some leak die there too but this is from the recharge in the spring I think. Then they tell me there was only 3 ounces of R134a in it. I just paid the good mechanic for 46 ounces yesterday,so they are either right about the lines or trying to scam me for a bogus R134a charge.

I got it home and cleaned it all up underneath with brake clean and rages. I have it up on ramps and my black light is ready. If it's going to puke all that oil and die out I'll see it tonight.

The AC is working well right now so we'll see.

How does an AC sytem go from working great last summer to needing a rear evap,compressor and lines all at once? I think the initial spring recharge is at fault. It seems to me they overcharged it and that is causing all trhe problems.

Good luck proving that though....