bhai go to Gulshan Block 7 at Neepa motors,Just neighbour of it, they have good mechanical shop, plus brand of clutch plate( dont go under that, u have to go to Tibet plaza or rima plaza for original Exedy clutch )
for better fuel mileage ,go to auto Xperts in Gulshan Block-5, they have imported products from Turkey Automobile Research Organization regarding fuel consumption
They have also imported electronic circuitry named "Rust Fighter" which has to be installed with your Car's body and ions/cations replacement reaction would save ur car from rust(which is best for model of 5 years older models like urs of 2003)
For a/c, go to Bashir
Bhai, remember always "JACK OF ALL,MASTER OF NONE" , not a single shop in Khi would provide u quality service under 1 roof, u have to travel to different specialists.
simply "JIS KA KAAM USI KO SAANJHEY"