7–5 62-12259
00012 High Coolant Temperature
• ACTIVATION:
Condition 1: Ambient temperature is below 120°F (48.9°C) and engine coolant temperature is above
230°F (110°C).
Condition 2: Ambient temperature is above 120°F (48.9°C) and, engine coolant temp is above
241°F (116°C).
Condition 3: Ambient temperature is at or above 120°F (48.9°C) and the engine coolant temperature
has remained between 230 and 241°F (110 and 116°C) for more than five minutes.
• UNIT CONTROL: Engine Operation: Engine and unit shutdown and alarm.
Electric Operation: Will not activate in electric operation.
• RESET CONDITION: Auto reset after 15 minutes if the engine coolant temp falls below 212°F (100°C), or
alarm may be manually reset using the display mounted keys or by turning the unit off and back on again.
NOTE
Follow the Troubleshooting steps until a problem is found. Once a repair or correction has been
made, the active alarm should clear itself (refer to reset condition above). Operate the unit through
the appropriate modes to see if any active alarm occurs.
Corrective Actions:
1. Check Coolant Level
WARNING
!
Do not remove the cap from a hot coolant system. If the cap must be removed, do so very
slowly in order to release the pressure without spray.
a. Check coolant level in overflow bottle. Level must be in the normal range.
b. Inspect connecting tube between overflow bottle and radiator. Connections must be airtight. No
leakage or holes in tube.
2. Check Freeze Point Of Coolant - Use Coolant Tester to check concentration of anti-freeze mixture.
Must be between 40% to 60% Ethylene Glycol to water mixture.
3. Check Airflow Through Radiator and Condenser Coil
a. Inspect condenser and radiator. Ninety percent or more of the coil surface must be undamaged.
Condenser/Radiator coil must be clean.
b. Check airflow (with unit running). Verify even airflow through the entire coil and no “dead” spots.
c. Check condenser fan rotation / operation. Fans should operate correctly. Air should be directed in
through the grill, and into the engine compartment.
4. Check Water Pump Belt - Check belt condition. Verify no glazing, no cracking, no slipping. Replace belt
if required. Refer to Section 8.5.12.
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