Pulley not turning ???

My Mrs has just brought a used C3 from a dealership smart little motor 8k on the clock it’s a great little car except I need to ask one question

When looking down into the engine bay on the left the bottom pulley on the belt isn’t spinning whilst the belt is moving ?? Is this normal it spins when air con on but to me should spin all the time as the belt is surely just wearing down and heating up ??? Any help would be appreciated as they have given me a 6 month warranty and want sorted if it’s a fault ?? Many thanks

The video won’t load onto here but it’s the bottom pulley with the bolts on

Hello

From what I can see this is correct.

You have on-demand services like oil pump, a/c etc.

So they don't always deliver power and just idle most of the time because they are 'on demand'.

This helps with fuel consumption but causes all sorts of problems you wouldn't expect when they get worn.

Oh ok surely the belt don’t last long then ??

Pinchersmotor wrote: ↑Fri Aug 23, 2019 6:14 pm Oh ok surely the belt don’t last long then ??

I can't see the video, so it is difficult to tell, but seeing as you have on demand services from that belt, I would say the belt would last as long as any other car but it just looks a bit odd.

If pulleys don't actually turn, you will know it. They squeal and smoke, no mistaking a seized pulley.

You didn't mention smoke or squealing, so I think you will be OK.

But be sure to keep the servicing up to date

The item you are looking at is the air conditioner compressor clutch. It only spins when the aircon ECU tells it to. It maybe a lot or it maybe a little.
It is made of many parts but basically it has an outer pulley and and an inner hub connected to the compressor input shaft. There is a bearing between the hub and the pulley so the pulley can run freely on the hub when the clutch is not engaged. When the clutch is engaged the hub and the pulley lock and the compressor is driven.
If you look closely you will see that, despite the compressor not running, the pulley is spinning with the belt.