Thank you for your question and I understand your concern.
Having the model number of your Whirlpool dryer would provide the information needed in order to know if its gas or electric and it would also provide the information needed to know what type of controls it has.
Generally speaking if the dryer is getting warm but not hot could be related to a restricted vent system. It can also be caused by faulty thermostat or heater too. If it’s a gas dryer it could also have weak solenoid coils preventing the gas valve from opening whenever the thermostat calls for heat. For testing purposes only: Disconnect the vent hose and then dry one load. If it appears to dry normally, inspect and clean the vent system.
Reply with the model number for model specific troubleshooting assistance.