heat on then off then on

Initially diagnosed the failure mode as a faulty thermal fuse and when the fuse was replaced was encouraged to find the heat working...then it shut off again. After a period of time that the dryer was off the heat would come back on. After reviewing the site extensively I found a description of the failure mode similar to mine and determined to replace the 2-terminal & 3-terminal coils (kit is less expensive than either by itself). My older Whirlpool dryer needeed to have the top panel removed in order to get to the front panel screws and once the front panel was removed the coil assembly was pretty easy to identify. The retention "plate" was attached via screws that were a little tough to get to but an offset phillips screw driver did the trick. The coils were "keyed" in such a way that they would only insert one way to be properly oriented. So I've earned my appliance repair merit badge.