Baskadia

There is a lot of things which is responsible for low coolings in your car.

If you don't service your car's ac regularly it will effect on evaporator due to which it will get choked up and cooling will get low, other reason of getting low cooling in your car is your uncleaned or damaged ac filter due to which coolings get decreased, if you won't service your ac regularly it will effect to whole VCC( vapour compression cycle) and it may leads to create issue in compressor.

Only way to get your car's ac work properly is there service on regular basis.