The main problem with Pakistani coolants (guard, nasa, osaka) is that the manufacturers don't mention the chemical formation on the labels. This creates suspision on these coolants. I am now thinking to pour Toyota coolant first. Later, if everything goes fine, I will switch to Caltex long life coolant. Moreover, the radiator fan and the temperature needle remains on half during daytime and remains on quater during nighttime while AC remains switched ON all the time. I am thinking to make the fan to auto but fear of gasket failure is stopping me.