We have a Kenmore gas dryer that won't heat. We

Hello Friend, Your problem is very simple to fix. You're dryer needs a thermal fuse and or gas valve coils, and maybe an igniter all three are very simple and affordable to replace. To replace the thermal fuse just remove back cover of dryer and look down where the air blows out. Now, just to the left where all the wires are you will see a white plastic part with two wires plugged into it. This part is called a thermal fuse. Just remove these wires and replace the thermal fuse. Now, if this don't solve the problem you will need a gas valve coil kit. To replace coils just remove front of dryer body and look below drum you will see the gas valve. The valve coils are located on top of valve (two little round black cylinders). It's simple, just remove the two screws from the little metal bracket that holds them down, unplug the wires from them and just lift them straight up off of the valve. Take notice that one has 3 wires and one has 2 wires. Just replace with new coils and plug wires back in and re-fasten metal bracket. Your dryer will run like new, if it doesn't then you will need to check the igniter. The igniter is attached to the end of the burner assymbly by one screw and a simple two wire plug. Inspect for breakage, and replace if needed. Happy to help, Tim. And please don't forget to give me your rating for my help.