I am putting one problem to me which I do not understand and need a kind advice.
I changed the engine of my Nissan Sunny B-14. I replaced the original GA14Efi with a GA15efi one. As far as engine, it is working fine
As long as I am driving the car in the city, there was no problem. However the problem was faced only in hot summer while driving from Karachi to Hyderabad. The car at most go 35 Km and gets heat up. even trying to run the fans on direct than auto did not make any difference.
The fins of radiator were highly pressed to close. Although I got opened almost each of them using some tool by a radiator mechanic, It did not work.
I got the radiator cleaned up manually and by some chemical recommended by radiator whole seller at Karachi. The chemical named as "cutting oil". But winter came by the time and it could not be tested if worked or not.
However I noticed something strange twice. It was boiling noticed in the side bottle after a drive of 8 km where the temperature indicator was just on middle and the fans were not even started. I checked the fans functionality by bypassing the auto system as well as starting the AC and found both fans running.
One thing is that the fans do not start before the needle shows the temperature mid-way and I think that the coolant valve too. there is no leakage of water and for weeks, I do not need to add water at all. The everyday drive of the car is almost 15 Km on the average. I am advised by the mechanic to change the radiator first but still I am confused and I need a knowledgefull advice than a traditional mechanic?s advice.
I hope I could explain my problem.
With Best Regards