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My success story...
Don't use heat , I cut mine with a 90 deg air grinder ....make a slit down the nut then take a chisel and insert it in the cut slot and hammer it wider while hammering in a loosening rotation...this splits the nut a bit and it works every time and I've done several over the years as a technician in shop situation, after trying the heat thing and only doing a bunch of damage to the stat the first times.
I only do this to the two lines from stat to engine and tank then they will be replaced.
Good luck,
Mike
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