On the 102 engine (4cyl) the main fan is an electro magnectic fan triggered by the switch.

On the 103 engine you have a regular fan clutch. The auxiliary fan kicks in at about 107 and may also kick in if the A/C is on and the A/C pressure is high.
I would check my coolant temperature sensor. Here is a great thread for you to read...

Aux fan not coming on, relays look good, what to check next?
Although they are talking about the 104 I think you can get the idea.
Good luck!