Trooper LTD V6-3165cc 3.2L SOHC MFI (6VD1) (1997)
Temperature Gauge: Description and Operation
The engine coolant temperature gauge consists of two intersecting coils wound around a permanent magnet rotor. When voltage through fuse C-10 is
applied to the coils, a magnetic field is generated. This causes the rotor to rotate and the gauge needle to move. The magnetic field is controlled by the
engine coolant temperature sending unit. As the resistance in the sending unit varies, current through the gauge coils changes, and the gauge needle
moves according to the changing magnetic field. See the chart below for approximate resistance values for the sending unit under normal operating
conditions.
Engine Coolant Temperature ................................................................................................ Engine Coolant Temperature Sending Unit's Resistance
140°F/60°C ............................................................................................................................................................................................................. 160 ohm
150°F/66°C ............................................................................................................................................................................................................. 135 ohm
160°F/71°C ............................................................................................................................................................................................................. 110 ohm
170°F/77°C ............................................................................................................................................................................................................... 90 ohm
180°F/82°C ............................................................................................................................................................................................................... 75 ohm
190°F/88°C ............................................................................................................................................................................................................... 60 ohm