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Could have given more info, The blower works. When i pull the heat to high it blows hot air pretty strong but when i switch it to DEF(NOT OFF) it doesnt come out up top. On another note when i only pull it out half way there is not even a fraction of the heat coming out. sounds like there could be a clog of some sort.
I had the same problem and found out that the hoses from the heater slipped off the hose mount under the dash which is under the defroster vents. Got new hoses mounted them (difficult to reach) and they work great.