jJim McLaughlin wrote:

Sears Model 110.66822694. Installed new in 199

Put wet wash in, set "timed dry" for 45 mins, push start button.

Light inside drum operates fine with door open.

Drum turns as soon as start button is pushed.

Heat comes up immediately.
Run it empty for 30 seconds, open the door and hot air spills ut.

Drum will run 4 - 5 minutes, with heat, then shuts down.

Two possibilities here. First is the motor is overheating and shutting
down. If this is the case, shutdown will occur whether the dryer is
heating or running with no heat. A lint buildup could be a contributing
factor.

Otherwise, a high limit switch near the heat source is being activated.
This can occur if there is inadequate air flow. The dryer is
designed for a certain amount of air to pass around the heat source.
This could be impeded by a clogged filter or exhaust, or a leak around
the drum, whereby air is entering through a path other than past the
heat coil. Check the door seal and the felt seal around the rear
perimeter of the drum. You might also have a defective coil that
generates too much heat around the limit switch. Lastly, the limit
switch itself could be defective.