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Originally Posted by BusyBenz
A month or so ago I began using my block heater every night, set the timer to come on at about 4:30AM and that was fine, now with the onset of colder nights, now dropping into the low 30 degree range, the temp guage barely registers any amount of heat from the block heater.
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That's exactly what it should do. When it is down below 30 degrees, the amount of heat from the block heater is not sufficient to raise the temperature of the entire engine much above 80 degrees or so. But, that is all you need. Think about starting the engine in 80 degree weather. You don't want to spend any more electric than that.
Now, if the block heater is not working, you will know it when the temp gets down below 20 degrees. If it cranks for ten seconds and starts with a cloud of smoke and runs rough for 15 seconds or so, then the block heater is not working. If is starts like it's 80 degrees outside, it's working fine.