Coolant fan coming on 4 to 5 seconds after stating and staying on..

Hello, the cooling fan is also the condenser fan. The condenser fan turns on any time the air conditioning compressor is active. This is to act as the final refrigerant cooling mechanism before heading back to the compressor during the air conditioning system process. What you are hearing is probably the result of having the climate control system operating during the use of defroster or heat or other climate control setting. It's normal and necessary.