This is a fairly simple procedure. Just follow these steps:
1. UNPLUG the dryer. Dangerous voltage is still present even with the dryer turned off.
2. Turn the dryer around so you can access the rear and remove the exhaust vent hose.
3. Locate and remove the screws around the perimeter of the dryer back panel and remove panel.
The dryer heating circuitry will be located on the right hand side (as viewed form the rear). The heating circuits consist of the following components:
Heating Element - (part number 660982)
*Thermal Cut-Out (TCO) - (part number 279769 includes the Hi-Limit Thermostat).
*If either the TCO or Hi-Limit Thermostat is determined to be defective it is recommended that you replace BOTH parts at the same time. That's why they are commonly sold as a set. Failure to do so may result in premature failure of any parts you replace.
The heating element is located inside the heater box. The TCO is located on the outside of the heater box on the end opposite the heating element terminals. The Hi-Limit thermostat will be located adjacent to the heating element terminals.
Searspartdirect.com has an excellent exploded view diagram of all these components. Just type in your model number and locate the following under the "bulkhead" section:
TCO/Hi-Limit Thermostat - Item 1
Heating Element - Item 14
Hi-Limit Thermostat (by itself) - Item 34
The reason I mention all these components is because if you have not confirmed the heating element to be defective, you may actually have a blown TCO or Hi-Limit Thermostat. Its easy to assume a bad heating element if the dryer fails to heat, but it may or may not be the cause. Just some additional things to consider, that's all. These components cost less than a heating element too. If you have determined the heating element is bad, then continue with the following:
4. Disconnect the leads to the heating element and locate the screws that hold the heater box in place.
5. Locate the screws on the outside of the heater box that hold the element in place. You may also have to remove the TCO and Hi-Limit Thermostat.
6. Once the screws are removed, the heating element will slide out of the heater box. The element fits tight and it may require a little effort.
7. Once the defective element is removed, install the new one by sliding it inside the heater box. Make sure you align the screws holes.
8. Reinstall the remaining components and reinstall the heater box.
The rest is self-explanatory.
NOTE: A good heating element will read approximately 9 to 13 ohms. Make sure you disconnect any leads before taking any measurements to ensure accuracy of your readings.
The following link explains a good portion of what I've already explained to you, but it may help as well:
Pay particular attention the section that discusses proper air flow. The majority of all dryer heat related problems are attributed to poorly installed, kinked, clogged or crushed exhaust vent ducting. If you haven't thoroughly inspected the dryer and ducting recently, now may be a good time to do so. Otherwise, any components you replace will fail prematurely. Not to mention, a clogged dryer is also a fire hazard.
If you have any questions, please let me know. I hope this information is helpful to you.