Vectra c blowers not blowing- still getting heat

Ok so it's a vectra c 1.9cdti elite 150bhp, other day tried delisting window with blowers but nothing came out although heat still comes out .

I read on here it could be the resistor but my heating unit is the one were it's a digital knob and has 7 speeds so I don't know if it's resistor , all the buttons work and light up its just not blowing

Any help greatly appreciated
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