I have a Kenmore Heavy Duty Gas Dryer,
Everything seems to be working properly, but no Heat

Indianmoviehelp is correct. Especially with gas dryers the vent must be completely clear to heat properly. Check dryer vent screen and back of dryer hose to where hose exits house. You say everything is working properly? Also you will have a air inlet and air outlet screen at the rear of drum,make sure they are open and clean. Check the hi-limit thermostat on the burner chamber of continuity. If none you will need to replace it. If all this has not corrected the problem, check your temperature control.

The heating element might have gone out, do not continue to mess with dryer as it is GAS until a professional takes a look at it.

natetheskate, Gas dryers do not have heating elements!