Trex

Hi my daughters 1.25 Zetec mk 4 has an annoying electrical fault
The heater fan , with the switch in positions 1-4 will stay running with the ignition off and key removed
This caught me out one day when I borrowed the car for work
Left fan in position one . Resulted in one very flat battery
Have removed fuse box , drivers foot well and removed green relay the left hand one . But the fan will still run with ignition off ?????
Has anyone got any ideas ???
Ps the indicators also work with ignition off