Abstract: A voice playback temperature sensor is provided including a temperature sensor situated within an engine of a vehicle and adapted to transmit at an output thereof a voltage with a level directly proportional to a temperature within the engine of the vehicle. Further provided is a potentiometer having a first terminal connected to a constant voltage source, a second terminal connected to ground, and a third terminal. The potentiometer is adapted supply a user selected, adjustable voltage at the third terminal thereof. Also included is an operational amplifier having a positive terminal input connected to the output of the temperature sensor and a negative terminal input connected to the third terminal of the potentiometer. The operational amplifier is adapted to provide an activation signal at an output thereof upon the voltage at the positive terminal and the voltage at the negative terminal thereof differing by a predetermined amount.