Hot Coolant Temperature Indicator

The "HOT" Coolant Temperature Indicator comes "ON" to warn the driver of high coolant temperature.

With the Ignition Switch in "RUN," "BULB TEST" or "START," voltage from I/P Fuse #11 is applied to the "HOT" Coolant Temperature Indicator. In "BULB TEST" or "START," the lamp is grounded through the Instrument Cluster Logic Chip so that the bulb can be tested. In "RUN," the current path is also completed through the Logic Chip in the Instrument Cluster. The Engine Coolant Temperature Gage Sensor resistance will be low when the coolant temperature exceeds 1265°C (2585°F) causing the Logic Chip to command the lamp "ON."