Burning smell from air vents?

Guitarman

Member
Hi guys, over last few weeks there has been an intermittent nasty burning smell coming from the air con vents.
It only lasts for a minute or two then goes away. It smells like burning plastic.
If the heater is on warm it happens sooner. If the aircon is on cold it takes it quite a while before the smell happens.
Could it be the blower motor needs replacing?
Or anything else that could cause this?
The last two weeks also been getting the 'increased battery discharge' warning occasionally, so I'm thinking the two are related?
Any help much appreciated!

Z4 23i btw.
 
Do you get the smell if the fan is turned off and the air is just being pushed through by the cars movement?
 
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