Papa Bear: Sorry didn't read your earlier post, anyway this is how it all started.
During the heat wave in CA a month ago my analog coolant temperature gauge moved up beyond the 3/4 mark but only during uphill drives.
I was due for a flush, so drained the old coolant and since it was due to replace the hoses (>100K on original hoses), I went ahead and replaced it during the flush.
Now after that too the temp used to shoot up, then I went ahead and replaced with OEM thermostat. This didn't help too, so took it to the mechanic and his conclusion was there was air in the closed loop system. Therefore he burped it running the car with the radiator cap off for 45 min, this removed all remaining air (this is what he told me). The whole system was thoroughly pressure checked for leaks and hot spots (clogs) in the radiator.
Now, that too hasn't helped and I am getting tired off my car and all the expenses I have put in to fix the problem. Following on what Dave H said, my last choice is the radiator, that alone hasn't been changed with the pump. Starting with a new radiator should hopefully put an end to my agony.