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 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 the temperature exceeds the maximum temperature shown in Table., inspect the cooling system to determine the cause. See the Century Class Trucks Workshop Manual for troubleshooting and repair procedures.
Table 1, Maximum Coolant Temperature
|
Maximum Coolant Temperature |
|
|
Engine Make |
Temperature: °F (°C) |
|
Caterpillar |
215 (101) |
|
Cummins |
225 (107) |
|
Detroit |
215 (101) |
|
Mercedes-Benz |
221 (105) |
Table 1, Maximum Coolant Temperature
If coolant temperature rises above the maximum temperature listed in Table. on EPA07 engines, 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.