Hi guys I have 93 LX 1.9L. I have been having som a/c issues where it's not cooling and compressor locked up. I took it to a shop and that didn't go well, that "mechanic" was an idiot he apparently had no clue or wanted to short change me. I eventually had to redo the whole system myself except the evaporator. So all new parts are on the car. So now I want to know what is the running high pressure and low pressure. Presently I'm doing about 300 hi and about 35 on the low. It cools very well at idling and normal traffic but on the highway at times it goes warm then cool, not a constant cool. The compressor cycles normally to me but could be a issue. I had a good vacuum and put in 28oz of freon. Now for this car how much freon is needed? And the working range pressures. Conversations welcomed, thanks I want to know where I may have gone wrong.