A model number may help others help you.

I am assuming it blew the thermal fuse in the motor circuit?
Make sure the exterior vent louvers are opening all the way.

Undo the dryer from the exhaust
Run a load
If you do not want lint in the house.
Take a pair of pantyhose, put one leg into the other and attach this to the dryer exhaust.
Leave enough room behind the dryer so it can blow out like a windsock.
Run a load.
Both the above will allow you to check the air flow and temp.
Also the above is NOT recommended for a gas dryer due to possible carbon monoxide problems

Clean/check the blower wheel.
Make sure it is not stripped out.

Check the heater.
Unplug the unit and both wires to the coil.
Check it with a meter, should be around 12 ohms.
Then check from each side of the coil to the case/frame, both should be infinite ohms (open). If not the coil may have sagged or broken and is touching the case. This can cause it to run on high and the thermostats cannot regulate it.