Hi, thanks for using JustAnswer.com. Please remember, I do not get paid for my time and expertise until you accept. Does the dryer run for a long time and not dry or just shut off before the clothes get dry?
Number 1 in the picture is the filter housing. It may be obstructed and not allowing good air flow since you say the vent line is in good shape. Make sure the vent hose is not pinched or coiled behind the dryer and the vent cap outside opens freely. You have an air flow issue of some sort.
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