Not sure what you mean with "aux fan(s) are coming on low stage". Do you mean to say that aux fans should also start running in addition to the main fan? Or do you mean that the aux fans should run on slower speed?

According the to the technician, the fans are working fine. I can hear and see the fans working in full force since the ambient temperature here is around 45 degrees C. However, they are not coming on low speed nowadays. Low fan speed happens during the months of Dec-Feb when the temperature is better, i.e. around 20 degrees C.

Will it give a problem if the fans are on high speed when the engine is idling?