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The coolant level in the recovery bottle is determined by the coolant temp. As the coolant warms up and expands, it starts to fill the bottle proportional to temperature.
You propose to indirectly measure temperature by the level in the recovery bottle. In order for this to work, the cooling system must have a precise amount of coolant in it. Any change in coolant quantity will throw the temp calibration out. Wouldn't it make more sense to measure the temperature directly like they do already? It would be easy to take a LM34 sensor, plug it into an Arduino and let the chip to the rest.
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