Having problem with low air flow from vents. Heats and cools just fine. on 2005 Dodge Ram 1500

Noticed last summer. When driving long distance there is cold air from the floor vents even though the heater is on and coming through the vents (low air flow).

There are no check engine lights or codes.

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2 answers
YOU MAY HAVE A BLEND DOOR OR FRESH AIR DOOR PROBLEM.THESE ARE HARD TO DIAG. I REC YOU SEEK DIAG
vacume leak check the lines under the battery/control forcruse control