7.3 Engine Block Heater
The block heater will basically keep the oil and the coolant warm to aid in an easy start. Ford says plug it in at least 2 hours before driving if weather is 30 degrees or below, but leaving it plugged in all night will not void nor hurt anything.
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Aaron 99 F250 CC PSD 215,000 miles
Houston
I'd rather be stroked, than rammed!!