Q: Ac and heat only blows when moving.

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Ac and heat on my Dodge Dakota 2002 only blows when moving. Even if it is off. It is never very strong, just seem like the air is being pushed through. If I crack the window it pushes harder. I can change the temperature according to the dial. What should I look at or diagnose.

My car has 80000 miles.
My car has an automatic transmission.

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