Following a t-belt job the low speed fans do not work. I've had the AC turned on regularly since belt was replaced and never noticed the low speed wasn't on. It definitely worked before as i was diagnosing an overheat problem (which led to the thermostat and t-belt job.

Is there a separate fuse for low speed fans or is it only the big 60 amp one?

I'm wondering if one of the temp sensors was left unplugged. There's one behind the engine but are here others that determine when the low speed fans come on? There is a connector on the upper, driver side of the fan unit which seems OK. Are there any other connectors?