If it is getting warm at all, your heating element is not bad, It's either good or bad, no in between. If it is taking longer to dry clothes try clearing the exhast hose of lint,(i'm sure you check the lint screen) at the back of the dryer and also on the outside to make sure a good flow of air is being exhausted.. Check this first before changing the element. If you have an ohm meter and you just have to check the element, first disconnect the dryer from its power source then disconnect one of the elements wires. set your meter to ohms and touch each lead to each end of the element. You should get a reading (resistance) or hear a tone if your meter is programed so. if this happens the element os good if not the element is bad and needs replacing. Now you are probably thinking ,ALL THAT? I would rather just buy a new dryer.