Coolant temperature below normal
| Cause | Correction | |
| Too much air flow across the radiator |
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Check/repair shutters, fan clutch, viscous fan as required. |
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| Incorrect thermostat, broken thermostat jiggle pin or contamination in thermostat |
|
Check/replace thermostat. |
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| Temperature sensor or age malfunctioning |
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Verify that the gage and sensor are accurate. |
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| Coolant not flowing by temperature sensor |
|
Check/clean coolant passages. |