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Another way of getting the Arduino to do the job of sensing temperature and moving a grill block is to use a thermistor and a servo. There are some good how to's on the Arduino site. It will take a little programming. One way would be to connect the thermistor to the 5V output, and get a numerical "voltage" reading from the analog input pins on the Arduino. (sorry I am forgetting the correct terminology). Tape the thermistor to a coolant hose or otherwise put it in place to measure temperature and note the numerical voltage reading when it reaches your desired switch point. Then just program the Arduino to move the servo to the appropriate location as the thermistor voltage value changes. Different servos use different scripts but there are plenty of how to's on servo's. They can run off of the Arduino 5V output.
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