radiator fans
 

i now that your tow fans should coem on at differnt times but i had mine set in my sim tec so they both came on toghether i have just noticed that now only the main fan is coming on is this a problem i need to worry about and if so what could be the cuase of it, i have been told that they only need one fan but it must be better to have to on at once then just one

some only run 1 when having a front mount so it's not too close, i'd get your ecu checked