2001 Mitsubishi Eclipse AC blows hot after numerous repairs

Yeah and thats where I am stuck because they are a large chain of repair shops that operate locally and they have good reviews with the BBB. They have told me the run pressure tests every time I take the car in and insert dye into the system to see where the leaks are. My worry is, can those pressure or vaccuum tests cause more leaks? It just seems that every time I take it in a new leak is found. Which in mind doesnt make sense, since the dye would show the numerous leaks, and not a new one every time I take it in, correct? Also does the radiator/coolant play a role in the cooling system? Appreciate the help.

Sometimes a/c pumps are reman and leak right away, it could also be a psi switch cycling on and off too fast. If that is defective you will only occasionally get cold air and improper cycling of the pump which will eventually fail, I live in the hot desert and have played this game before

I wanted to add that mitsubishi eclipse 01 has an automatic compressor controller right behind the glovebox(left side) that could be the problem to your a/c pump not working correctly

So I took the car back to the same place and told them that the amount it cost to have them perform repairs to not have the ac function correctly was not just. As a result they said they would take it back and look at it for no cost. What they came up with about a week ago was that the expansion valve that I supplied them from the parts store was defective and that I needed to get them another one. So I went and got a new expansion valve and took it back so they can perform the replacement. I just went back today to pick up the car and they informed me that the ac still wasnt blowing cold and the reason for that was because Mitsubishis only can use Mitsubishi brand expansion valves. They said they found this out after they called an AC repair shop and that they were having the same issue with a Honda. They claim that imports (Mitsu, Honda etc) can only take a replacement expansion valve that is from the dealership. After so much back and forth with these guys Im hesistant to believe that, but I pose the question to you guys, is this remotely possible? Can a Mitsubishi Eclipse expansion valve only be replaced by an authorized Mitsubishi expansion valve part? Or can I use an expansion valve that I purchased at a reputable national chain ( Oreilly Checker)?

So I took it back and had them order an expansion valve since they said the valves I took them werent working. They kept the car for a few days and returned it with only slightly colder air. They say it blows at 55-60 degrees when idling and it gets down to 48 degrees while driving. Dunno if these numbers are acceptable/correct but it surely doesnt feel like the ac is as cold as it was before they got their hands on it. The manager said that the final step is to turn off the heat valves? Dunno what that means, but that he thinks there is a flap in the dash that is not closing correctly and as a result the hot air mixes with the cold air producing those cool, not cold air. Is this true? He says that while the temperature is still hot they would close those heat valves and when it starts getting cold they would open it again. He suggested this route instead of taking the dash apart to find that faulty flap to repair. Anybody know anything about this claim?