John Deere 4230 AC problem

[Wade Case]

I have a quetion that i can not find any help on i have a 4230 john deere arpond a 78 model put new ac system on it and know it will start blowing cold out all the vents for aliitle bit. Then it will quit blowing out of the left two vents and the compressor stops also. I have changed the silioned out were the breakers are put a new switch in that turns your ac on and still hasnt fixed the problem everybody that i talk to dont have any clue. I also have changed the breakers as well