Coolant Temperature Gauge Always Stays In Cold Position

One month ago, the temperature gauge of my 1996 Ford aerostar(3.0L) will move to normal after 20-minute driving. Now, the gauge always stayed at cold position even when I short circuited the coolant sensor connector to engine ground. I replaced the two coolant temperature sensors. The engine code is still P0118. When the ignition switch was turned on, the voltages measured were:(1) 4.0 volts measured between the one-wire coolant sensor connector and engine ground. (2) 2.8 volts measured between the green wire of the two-input sensor connector and ground. (3) 0.1 volts measured on the white wire of the two-input coolant sensor connector and ground. When the ignition switch was turned off, the resistance measured were: (1) 45 Ohms measured on the one-wire coolant sensor connector and ground (2) 14K Ohms measured on the green wire of the two-wire coolant sensor connector. (3) 0.1 Ohms measured on the white wire of the two-wire coolant sensor connector and ground. Any idea will help.

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