Tumbler Won't Spin
If the tumbler won't spin when it operates, unplug it and try to move the tumbler by hand. If it won't budge, then something is jammed. If it turns with no resistance at all, you may have a problem with your drive belt. If it turns with consistent, minor resistance then the problem may be electrical. Follow the instructions of your user's manual to remove the tumbler so the belt drive and motor are visible. Inspect the drive belt. If it hangs loose, it needs to be tightened. If it is frayed or has worked its way up the drive shaft, it should be replaced. Try to turn the driveshaft leading from the motor by hand. If it won't budge, then your motor is seized and needs to be replaced. If nothing is wrong with the belt or the motor, then the problem is in the control circuit. It may be damaged, preventing the motor from engaging.
Dryer Stopped Working Mid-Cycle
If the dryer stops working mid-cycle and will not respond to any of the control functions, unplug it, empty it of clothing and pull it away from the wall. Remove the service panel on the back and open it. Be mindful of smoke and the smell of burnt plastic; these are good indications that something carrying electricity has just died. This particular model of dryer is notorious for its electrical plug and power block, which should be the black box near the bottom in the back. If there are any signs of charring, melting, or discoloration, the power cord and block are your culprits. These can be replaced with a new power cord and terminal-connection wire kit obtained at any hardware store. If there is no indication of electrical damage, the problem is likely the control circuit set underneath the control board on the face of the dryer. Such boards can't be fixed, only replaced--a task best left to a certified repairman.
Dryer Won't Stop Running
Ultimate Car II Dryers are fitted with a mechanical timer that sends an impulse to the control circuit board to stop running once the set amount of drying time has elapsed. This is because, should an electronic timer fail, this would necessitate the replacement of the entire circuit board. Confirm that the mechanical timer is indeed broken by opening the dryer's door. If the dryer stops, the circuit board is working fine and is not the problem. Simply slide off the protective faceplate of the dryer, unscrew the control board beneath, and flip it over. Connected to the back of the timer's knob should be a small round device with two wires running to the circuit board within the body of the dryer. Unscrew this device from the back of the knob and disconnect the wires. A replacement timer costs a few dollars and should screw into place without trouble. Reconnect the wires and put the dryer back together. It should work fine now.