i am posting this for a friend of mine. i tried searching for this but most topics only talk about temperature not power. the air conditioning gets cold, but it barely blows. it makes a loud whistling, but produces barely any air. he has a 06 cummins 4x4 2500. any ideas on the problem?

 

i forgot add that it takes awhile for it to switch to defrost after the switch is pressed

 

It's a known blend door issue on the 06's, I believe. Take it to the dealer, they have a fix for it.

 

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he took the truck to the dealer and they said it was fine. do you guys thinks it is a clog or broken door or a bad unit?