Temperature Warning Lamp/Indicator: Description and Operation

Engine Coolant Indicator(s)


TEMP
The HOT COOLANT INDICATOR illuminates when the PCM determines that the coolant temperature is greater than 128°C (262°F). The HOT COOLANT INDICATOR control circuit is grounded by the PCM, causing the HOT COOLANT INDICATOR to illuminate.

The IPC performs the displays test at the start of each ignition cycle. The HOT COOLANT INDICATOR will illuminate during this test.

Coolant Heater
The optional engine coolant heater (RPO KO5) operates using 110-volt AC external power and is designed to warm the coolant in the engine block area for improved starting in very cold weather -29°C (-20°F). The coolant heater helps reduce fuel consumption when a cold engine is warming up. The unit is equipped with a detachable AC power cord. A weather shield on the cord is provided to protect the plug when not in use.