Your dryer is equipped with one drive motor. If the belt were broke the drum would not turn. The drive portion has nothing to do with the heating circuits of the dryer, other than driving the blower fan assembly to circulate air. More than likely you have a problem in the heating circuitry, or improper voltage at the wall receptacle. The following link explains:
The most common cause of dryer heat related problems is poor, or improperly installed exhaust ventilation. If you haven't inspected your dryer ventilaion ducting any time recently, now might be a good time to do so. If you leave a dryer in a clogged condition, it will overheat to the point of failure. This also creates a potential fire hazard.
The voltage at the wall receptacle should be the first thing to check. Make sure you are reading 220-240VAC across the two hot leads (The LEFT and RIGHT slots). If you are only reading a portion of the voltage, this will cause the same symptoms you describe. The reason: The drive motor only uses half the input voltage to run. The heating circuits require the full 220 service.
If the voltage is bad at the receptacle, verify your breaker are set correctly. You may need an electrician to troubleshoot.
If the voltage is good at the receptacle, UNPLUG the dryer momentarily and remove the cover plate on the back of the dryer where the power cord is installed. Plug the dryer back in and take a voltage reading across the two hot (RED and BLACK) wires at the terminal block. If the voltage is good at the terminal, this verifies your power cord and the problem is INTERNAL to the dryer heating circuits. If the voltage is good at the receptacle, but bad at the terminal block, you have a bad power cord.
If you verify the input voltage and power cord are good, the most common fail item in the heating circuit is the thermal cut-out (TCO). This component is mounted on the heater box along with the Hi-Limit Thermostat. These two components work in conjunction to regulate the heating circuit temperature. If one or the other fails, it is recommended you replace BOTH components. They are often sold as a kit. Failure to do so may result in premature failure of any components you replace.
Read through the lnk provided and let me know if you have any questions. I hope this helps you.