if I remember its a closed loop cable in hard plastic that turns the switch on the heaterhose.
I might be able to take pictures in the morning or weekend
the fanswitch is buyable from simons but might be the same as volvo 240 eralier models use.
my cables doesnt have different colors so I just connected the different yellow ones to the red (12v+) till I found out wich one was 1,2,3