How can I fix my dryer?[Moffat - GE Older Style]?

I have two things wrong. I do not have heat and my dryer will not stay on. If I hold the start switch the dryer will run. I will not get any heat but as soon as I release the switch, the dryer will go off again. I have checked continuity on the element and the thermostats as well as the fuse but everything checks out. Does anyone have any suggestion? I am at wits end with this things and any suggestions would be greatly appreciated.