I have a Ge clothes dryer that was working fine then one day the timer stopped working. The dryer runs it just wont automatically shut off and it will not heat properly. It has to run two or three times longer than it normally would to dry a load of clothes. Once the load has dried the clothes feel hot and the dryer inside is hot but load another load of clothes and it still takes twice as long as it should to dry them. Any suggestions? I dont know if the timer has anything to do with it or if that is just a coincidence. Thanks for any suggestions. Its really been a good dryer so if its something I could fix I would like to.

Try running the machine in a timed dry mode.
If the timer now advances, it may be that half the heater coil is shot.
Some GE's use a dual coil depending on which side burns out, it can also stop the timer in Auto modes.

Here is an example of that type of dryer
http://www.applianceaid.com/image/geediagram.JPG

If you do not have the wiring diagram it may be glued to the back or they like to put them in the control console.