no check engine light no codes, the fan will not cut off, stays run when you cut the car off and take the key out

hello everyone friend of mine that lives next door has a volvo v70 or a c70 not sure what exact model but the cooling fan stays on a kills his batt, i figure a relay stuck but i did not find a relay but there is a flat gray box on the fan shourd motor so i just unplugged the main wire to it so it do...