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set the timer to turn ON at a certain time, that way the engine won't cool down if it turns off in the middle of the night. I know that within 10 minutes of my big 4.0L being off during 30 degree weather my engine will cool about 20 degrees, and in half an hour about 80. in one our my engine is cold again, not complete cold soak. it's still about 75 degrees. but cold enough to rob me of FE.
If it's set to turn off after a few hours. the engine will be totally cold again by morning.
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