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Saw it in the newsletter but was following the previous renditions of it years ago.
The coolant temp can be metered as if it were a voltage signal, you won't be able to put a voltage divider across it or anything because it'll alter the resistance of the sensor / backfeed ECU..
Just monitoring it as if it were a voltage input is safe and won't alter the temperature reading.. The next step will be monitoring it with an arduino and laptop in the car to see what the voltage points for turn on and off are (approx).
Down here in Australia a grill block would only be useful to assist with warming up slightly faster, the investment of time and money into it would never be recouped in the slightly improved warm up times.
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