39 degrees at idle and it's hot and humid here. But...53* at cruise speed. Stop, cold. The cooling fan seems really slow to respond. If I command fan to 90%, takes it 20-60 seconds to respond. If rpm at 2300 high side goes 350 plus until fan finally catches up. When commanding fan duty cycle how much delay should there be? Has aftermarket aluminum radiator, programmer, bro-dozer tires/wheels, etc.