I have a 2004 Chevrolet Optra and my cooling fan doesn't start. I plugged the fan directly on the battery and my fan worked. The fuses and relays in the fuse-box are fine. My cable seem fine. My temperature sensor seems fine, I was told to unplugged it to see if my fan start and it didn't. I was told it can be a switch relay direct on the fan but it doesn't seem to have one. The car has a single fan, no AC. What can be the problem?
Update: My friend's father is a mechanic and he found the problem: There is a cable missing on a temperature sensor. I didn't know I have two (one for the fan and one for the gauge in the dashboard). It's the cable with the kind of clip on the image below.
But now, I can't find the cable under my hood and I don't know the name of this cable. Anyone knows?