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Well the problem is one of two dead sensors then (or both). I'm not sure what a good 'full' reading looks like to the ecu from the coolant level sensor, so shorting the two wires might still mean 'coolant level low' to the computer.
Since it probably DOES work like you thought (two wires shorted when coolant level is good), check the engine temp sensor. Its on the passenger side intake manifold between the throttle body and the plenums that attach to the head, you cant miss it, its the only sensor with wires coming out of it atop the passenger intake. Maybe there are some docs online that explain how each sensor works so you can test them (I dont have the bentley book with me all summer)
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