You must be getting heat from a source other than the pre-heater. I've only got one source, and that is the block heater. Without my blockheater, my 6V92 will not start at sustained temps under 40 degrees. Had to use it a lot on our Pacific Northwest trip between Thanksgiving and Christmas. Typically, if I left it on all night, the dash gauge would read just over 100 degrees. I don't have VMSPC, so the analog gauge is all I have. One thing I learned the hard way is that if the block heater has been on, or is on, don't loosen the radiator cap....the heat, obviously, creates some pressure. You can guess the rest....
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