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I am trying to locate the Coolant Temp Sensor (ECU) 1989 G20 on 1990 Chevrolet G Series Van (G20)

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Shop tells me the coolant temp sensor voltage =0, and the thermostat is stuck open. I believe the thermostat is located on the engine block @ radiator return, but cannot find the coolant temp sensor. Can someone describe where to find it?
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