My Maytag Neptune dryer doesn't dry cloths. It tumbles but seems no air enters the dryer. Can't tell if it is a problem with the thermistor, fan or heating element. How do I go about troubleshooting the problem.

Remove the blower housing and clean it thoroughly. Check to make sure the blower is working. Clean the vent hose form the unit to where it exits the house. Next, is the element heating up? Check it for continuity. Unplug the unit first. If it is not heating up and no continuity, replace