A/C stops functioning in humid weather (summer or winter)

[LinWin]

When it's humid the a/c on my 2008 versa seda stops working at full capacity. There is a strange muffled noise and the air flow is greatly reduced. I have had it to the dealer many times. ( new fan motor, change air filter, new a/c temp. gauge, clean out hoses, on on it goes) Any ideas. They dealer seems stumped. I am extremely frustrated with this issue.

[ds08versa]

My car does the same thing and i am getting the same crap from the dealer i have had it in for this twice and no clue. Mine will do the muffeled sound when i have had the ac on for a little on high and turn the fan down to just keep it cool. then it just starts getting warn and no air is blowing. when i turn the fan back up it makes that stupid sound. and then slowly goes away. have you heard any thing else about this.