Here is a short account of the sad story
changed the compressor with a used (kabli) sanden 507. The ac worked brilliantly. After a week i noticed gas seepage signs on the compressor and the nearby area. Went to the ac guy since the compressor was in a weeks' warranty. The ac guy was also surprised since this was the third time the seal went nuts and concluded that condenser is causing head pressure and blowing seals. This must have been identified earlier but anyhow we exchanged the compressor and changed the codenser with a new chinese one (so called best quality Chinese).And recharged the system.
The system only cooled the for two minutes and then choked. The dryrer/receiver was ice cold. The drier bottle was replaced. Again same problem.
The ac guy was puzzled and i was red hot. Finally it was concluded that R134 gas might be sub-standard causing the problem. Next day gas was filled from other supplier's gas and same problem persisted. The expansion valve was changed and so was the compressor as the compressor had little noises. And then the system was recharged again hoping that it'll be the last time.
But no, i am still being tested for my patience. The system still chokes after blowing cold air for a minute. Almost everything is replaced now but still ac doesn't seem to work. I have been going to the same ac guy for the last six years for all sort of cars but never encountered such a pain in the a** problem.
Today, is the last day i'll try getting it fixed. Otherwise i'll be happy in sweating and keeping my pocket warm.
Any other area which we might have overlooked in checking the system?
thanks.