Quote:
Originally Posted by rolla-XRS
Block heaters are a dealer-installed option. No legal requirement for them since many parts of Canada don't require them. Southern Ontario, Montreal, most of BC are areas that don't need them.
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They are installed in every Toyota for Alberta though.
Where the block heater is on the newer engines versus it being directly in the coolant on older engines makes little difference. The block is heated and the coolant is inside the block, so it gets heated as well. It may take a bit longer but if you leave your car plugged in for enough time the coolant will get to about the same temperature, I'd think.
Aluminum is the best conductor of thermal energy used to build engines today, about 4-5x more conductive than cast iron.
Jeff