Don’t get into these shits. Major problems with cultus AC is not lowering/coping the highs side temperature which results poor cooling. Below are the solutions in order to improve cultus AC.
1) add water spray to condenser’s other half which doesn’t have fan so when AC performance struggles just spray water on it. In my opinion cheap way to improve AC performance.
2) Add scroll type AC compressor and Multi flow condenser will cost you fortune but best solution. This mode also improves fuel economy because of low load to engine.
The reason second option cost you a lot is because it needs different compressor which has different directions lines required additional cost and mounting plate. A new dryer may cost 13 to 1400. Main engine pulley need to be upgraded to bigger one I think it will uses baleno pulley. Pulley is required to give performance in idle rpm which scroll type struggle to provide at low rpm for that pulley is solution as bigger pulley increases rotation of connected pulley which of AC.
Rough price ideas for second option.
1) compressor 13 to 15k
2)compressor lines directions modification 3000 to 3500 including mount plate.
3) dryer bottle 12 to 1400
4) AC charging 2500 to 3000 if you found authentic gas
5) pulley upgrade 1000 to 2000 including labor
6) 600 to 7000 bandoo belt.
7) condenser 6500 to 7000 due to pkr devaluation.