Another cold weather test this morning ( had to move the car off the lot for snow clearing) Block heater plugged in, outside temperature minus 21 celcius. Turned on system, then off, then back on. fired right up and kept running with no problems.. Let it warm up to about 170 before driving it to work. Too slippery on the roads to play around, but ran smooth as usual. Took it home at lunch, no traction on the roads to speak of. (sideways is quite fun) System runs fine in these cold temperatures. Now if only I had a "new car" heating system to go with it .:)