Problem with blower fan

BMW M3 EVO 1996.
The blower fan (heating and cooling) has lost speed. It still blows but at best at less than half speed. It happened a couple of weeks ago and
since then has only once operated at normal speed. That happened out of nowhere. It just kicked in as I was driving and behaved normally for the rest of the journey. Next time I switched on the car, it was back to its anemic self and has stayed that way since. Is it something minor, something I can try to fix my-self? Will the (BMW specialist) garage be able to fix it (I take it for servicing in the next couple of months)?
Thanks for your help.
Vijay
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pack, and possibly you can as well
This is a situation that affects lots of makes.. Jim
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Jim wrote:

Thanks much Jim.
Vijay
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