It worked fine when I first got my 1990 Sambar Dias. When it quit, I charged it with a can of envirosafe R134a replacement with no results. (It's an r12 system) After reading other threads I thought maybe I overcharged it so I released some and it started working. I was able to check the low side pressure which was about 45 psi when running. Then it would only work when the fan was on low or medium. As soon as I select 3 the compressor cuts out. Today I tried it again and it only works with the fan on low but it will run for a while and stop for a few seconds and start again. When it's working, it blows nice and cold. There are no leaks. Anyone have any ideas?