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 175 to 195°F (79 to 91°C). See Fig.. If the temperature remains below 160°F (71°C), or exceeds the maximum temperature shown in Table., inspect the cooling system to determine the cause. See of the S2 Chassis Workshop Manual.
Fig. 1, Coolant Temperature Gauge
Table 1, Maximum Coolant Temperature
|
Maximum Coolant Temperature |
|
|---|---|
|
Engine Model |
°F (°C) |
|
Mercedes-Benz MBE900 |
221 (105) |
|
Cummins ISB |
220 (104) |
Table 1, Maximum Coolant Temperature
If the coolant temperature rises above the preset levels shown in Table., first the check engine warning indicator will illuminate, and, if the condition does not improve, the stop engine warning indicator will also illuminate and the buzzer will sound. At this point, the engine will derate or shut down, depending on the type of engine protection system installed.