bypassing is an option. But i recomend u to only do it once u tried everything coz there are a few reasons y the manufacturer did not build it tht way. Ive been to tht situation where washing and flushing the radiator wont help much. Instead after a few workshops, one good mechanic told me tht the inner side wall of the hose is full of rust and particles. I Replaced the hose and no more experiencing such prob.

I think 1 or the reason the fan is not default on is to lower down electrical useage, thus indirectly lowering fuel consumption. Kancil drivers shuld know it when the fan is on especially when the aircon is on ... the RPM is abit lower and u can feel theres lesser power.

1st u better check ur hose by pressing the hose which is connected to the radiator. If u feel like "crunchy" while pressing the hose, it means rust and particles had clogged the hose. Something like cholesterol in blood artery

I 4got how much it took to change the hose liao. I think its less than RM50. I would advice u to go to car accessories shops or ask around for the price so wont kena con.