I have a 2010 l322. Sometimes when starting the car the blower makes almost like a whistle noise and only blows about half as hard as it should, though it sounds like it’s should be blowing much harder. It’s almost like the air flow is leaking out somewhere when this happens. Sometimes it corrects itself but sometimes it stays like this for several trips. I’ve found this may be connected to the in car recirculation as it doesn’t seem to happen if I make sure it is off before starting the car. Any ideas?
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