Coolant Temperature Gauge
Physical instruments are listed here in alphabetical order. Some are optional and therefore not found in every vehicle. Digital instruments and gauges are described in their ICU section.
Notice: A sudden increase in coolant temperature may indicate engine or cooling system failure. Bring the vehicle to a safe stop and investigate the cause to prevent further damage. Do not operate the engine until the cause has been determined and corrected.
During normal engine operation, the coolant temperature gauge should read 175 to 195°F (79 to 91°C). If the temperature remains below 160°F (71°C), inspect the cooling system to determine the cause. See Fig..
Fig. 1, Analog Coolant Temperature Gauge - ICUC
For Detroit engines, if coolant temperature rises above the maximum temperature listed in Table., the CHECK engine lamp will illuminate. If the condition does not improve, the STOP engine lamp will also illuminate and an audible warning will sound. The engine will then derate or shut down, depending on the type of engine protection system installed.
For Cummins engines, the fan will come on when the coolant temperature reaches 215°F (101°C) and the check engine light will illuminate when coolant temperature rises above the maximum temperature listed in Table..
Table 1, Maximum Coolant Temperature
|
Maximum Coolant Temperature |
|
|---|---|
|
Engine Make |
Temperature: °F (°C) |
|
Cummins |
221 (105) |
|
Detroit DD13/DD15/DD16 |
234 (112) |