2005 fan blower power

This thread is for my uncles l322. The fan blower in his l322 is very weak. When he turns it up to full instead of it blowing like mad through the vents its very very slow and quiet ? It does work but not like mine ? Ive looked at the pollen filter and it dunt look bad should i change it or could it be something else ??

Possibly the Final Stage Resistor.... This hedgehog looking thing controls the fan speed

just removed pollen filter works a treat ! Looks like it was foooobed !