Coolant Temperature Gauge
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 (see Fig.) should read between 175 and 195°F (79 and 91°C). If the temperature remains below 160°F (71°C), inspect the cooling system to determine the cause.
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 illuminate and an audible warning will sound. The engine will then derate or shut down, depending on the type of engine protection system installed.
Fig. 1, Coolant Temperature Gauge
Table 1, Maximum Coolant Temperature
|
Maximum Coolant Temperature |
|
|
Engine Make |
Temperature: °F (°C) |
|
Caterpillar |
215 (101) |
|
Cummins |
221 (105) |
|
Detroit DD13/DD15/DD16 |
234 (112) |
|
Mercedes-Benz |
203 (95) |