First problem, my wife expects me to dance with her tonight, so we needs that fruity beer. Anyway, how is the fan speed? If my memory is correct, the blower motor may be the same as a Ford f-250 of the same year, without seeing it, not sure. Do you have air blowing out any other ducts while the defrost is on?
I've had a few, even with the filters the evap, or heater cores were packed with dirt in the fins. Not letting air thru. Pull the blower motor off. Check fan speed. Then peek in there with a mirror, or scope if you have one. See if it's clean.
It's the ductwork the air moves through under the dash. And the bartender here sucks.
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