My heater is blowing cold air I've changed thermostat and flushed core. on 1996 Dodge Ram 1500

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I'm still getting cold air from heater. I've flushed the heater core can't find moisture on floor. I have also pain stakenly got the air out of lines what could it be?
(2) Answers
(3) Comments
thanks for explaining what I was trying to tell this guy offense to the customer
Well it figures bunch of dumb asses no offense to the pro,sm can't read I did check them and they work fine. Problems still there.
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