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post #12 of (permalink) Old 19-03-2017, 08:35
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Join Date: Mar 2010
Location: Bristol
Car: MG ZS & Rover 200
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If these are cheap sensors, how about sticking one 10 mm above the max line, one on the minimum level line and use the circuitry to compare the temps. Assuming the sensor next to the liquid is hotter than the one next to the steam at the top, when the min one's temp falls to around that of the sensor above the max, time for a visual check of the levels...

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