Drying time suddenly is taking hours. No unusual noises. Drum is tumbling normally. Heat is ok. Checked flex hose ( pigtail) and lint trap - no blockage. Upon inspection of rear of unit, it appears no air is blowing out of the back of the dryer. Is this a blower motor problem? How expensive is blower motor? how difficult is repair?
You will want to pull the front of the dryer off and access the blower wheel. The blower wheel is attached to the motor of the unit so if it is tumbling then the blower motor would not be the issue. Once you access the blower wheel check for broken fins and for fabric sheets or lint build up that would cause air flow restriction.
Exhaust fan not working. How to cheek motor or switch. How to remove blower unit.
If the motor is not running you will want to check the thermal fuse on the blower housing to make sure that it is good. The thermal fuse should show continuity. If the thermal fuse is blown then you will need to replace the fuse and also check your venting from the blower wheel to the outside of the home for obstructions. If there are obstructions in the flow of air it will cause the fuse to blow. If the fuse checks ok then you will want to check the door switch to make sure that it has continuity in the closed position.