low air flow and low heat

Asked by Dilleydilley Feb 18, 2020 at 08:01 PM about the 2005 GMC Sierra 2500HD

Question type: General

How do I figure out the issue with my heat heater
core is clean not rust inside clean antifreeze and
low /almost no air flow / heat/ac coming out of
vents at idle and driving around town but 65 and up
gets warm air and more air flow coming out of the
vents

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