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Replacement parts for AMANA ALE331RAW | AppliancePartsPros.com

Could not find a wiring diagram for this unit but perhaps won't need it.
Also not sure where you are measuring the temp.

The high limit should not come into play if all is OK with the dryer, it is a safety device.
Sounds more like you have an air flow problem or if the lower temp settings do not work, the Heater,thermostat Item 11 in the "Motor and fan assembly" section may be burned out.

Not sure what this heater should measure would think about 5,000 ohms.

You are actually sucking the air through the system so poor drum seals etc. will effect temperatures. Also dirty lint filter especially if you use fabric softener, it can coat the screen greatly reducing air flow. If coated it has to be cleaned with soap and water.

Check the vent system.
Undo the dryer from the exhaust
Run a load
If the load dries correctly then you have a vent problem.
Clean/check the vent system. Make sure the outside louvers open fully.

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.

I'm running the dryer in an open area, inside a warehouse, with no vent pipe, and I have a thermometer in the exhaust. The blower housing doesn't appear to be blocked up.