check the system pressure and verify that your unit can actually absorb and shed heat, in some cases the condenser fins get plugged with mud and grease or even get coated with oil from your favorite sarviss station which makes a bigger problem as the condenser cannot shed heat and hence overloads the compressor.
There is a high pressure blowoff in the system but that is the first item Pakistani A/C mechanics disable - because the cashtoomer wants cooling under all circumstances in his dinky car with compromised cooling system.