I did not do this, just heard of it.
My driver was telling me that there are Universal Condensers, Radiators, and fans in the market. When installed on Mehran it does not heat up and Performance of the AC becomes better than original.
There is some logic to it. Mehran has only one fan for AC's radiator and Car's radiator. Both the radiators are stacked together.
In my opinion Mehrans heat up because there is only one fan and the radiators are stacked. Thats not a good way to dissipate heat from engine and AC's Radiator. If you look at Cultus it has two fans and also its two radiators are installed away from each other, they do overlap little but they are not stacked. Thats why Cultus never heats up during AC operation.
I am not a specialist in this and you should consult someone that has installed Universal bigger fans, raditors and condensers. Hope that helps