@umans
Tight teeka laga hai tumhain. Khair, lets hope kay problem solve hogayee hogee. But we will never get to the root of the problem, as to what exactly was causing it. I have few questions.
1) Heater core main kya kya saaf karwadiya bhai kay 1100 rupay mazdoori thuk gayee:??? 
2) tuning main kya kya set kiya hai us nay. ?? Yahan to 1200 main sab kuch check hojata hai. Tappet, Distributor, timings, vacuum.
3) Radiator cap Japani hai kya???
4)miscillaneos main kya kya included hai ??. Chai waghaira??
In the end, I would like to say that, yaar yeh problem aisa tha na, kay i think you would have been thinking, kay bhalay paisay ziada thuk jain, magar gaari sehi hojaye. Thats what I would have thought too. Anyway, Chalo, gaari ki kaafi saari cheezain new hogayee hain. BTW Whats in the radiator?. I hope its a good quality coolant and not water?.
Best of luck for friday night. I am waiting to hear from you.