1. If your standing in traffic the aircon doesn't perform as well as if the cars moving. That means the compressor is weak and changing it will help
Maybe not in this case....
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4. Mare sure that when the aircon is switch on that both thermal fans turn on
Sprinters don't have thermo's.. Clutch only with the 4AC
On the Air con box of the sprinters you will see a black box that adjusts when the compressor is activated at what RPM. The Sprnters out of the factory will not turn on at idle. As soon as it is at idle the compressor switches off.. You can change that by adjusting the knob on the black box..
Just start the car, turn on the aircon and then turn the knob to "-".... You will see and hear when the compressor kicks in.....
But bare in mind... that when you do these two things...
1. These cars do not have a idle up... Yours RPM will drop..
2. If left like this for long periods of time on a hot day in traffic... IT WILL OVERHEAT!!!!