My whirlpool dryer runs good but the heat does not stay on it comes on then goes off

Hello,

I will be happy to help you out with this. Is the dryer electric or gas?

If you could provide a model number to your dryer that would help also. Model Number Locater (http://www.applianceoutletservice.com/appliance-care-tips/model-and-serial-number-locations.htm)

Bill