When I switch my car from warm defrost air to just cool outside air my car makes a really louid clicking noise for about 2 min then stops... I thought at first it was the ac but the ac was not on and I just had it looked at so I was wondering if it could be the blower... because last winter I had an episode to where I turned the heat on and nothing came out of the vents... any help would be great.

First:
https://www.askmehelpdesk.com/cars-t...le-303903.html

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so I was wondering if it could be the blower

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Second, is the blower not working?
Some clicking is normal as the system switches but it shouldn't continue for two minutes. That could be a mode door actuator motor binding.

Ok it's a 2006 chevy impala with a 3.5 engine in it... the blower is working and blowing air just not as strong as it use to and it is making a loud clicking or klunking noise when I switch from defrost to just the vent to blow air in from the outside. I do not know a lot about cars but I would like to have an idea about what is wrong before I take it to have it looked at. I know its not the air because I just had it looked at and this noise has only happened twice to me and only when I go from defrost to just the vent.

One of the blend door servo motors (under your dash) is going bad.
Probably trying to make a go of it but just can't do the full swing. This will need to be checked out.

I took it to the dealership and It would not make any noise for them they could not find anything wrong because it would not make a noise for them to look at,