Engine Cooling System Overheating: Notes

Establish what driving conditions caused the complaint. Abnormal loads on the cooling system such as the following may be the cause:

• Prolonged idle
• Very high ambient temperature
• Overloaded Truck
• Slow traffic
• Traffic jams
• High speed or steep grades
• Snow Plow restricting airflow through cooling module
• Debris on front of the grill or the cooling module that is restricting airflow

Driving techniques that avoid overheating are:

• Idle with A/C off when temperature gauge is at end of normal range.
• Increasing engine speed up to 2000 rpm with transmission in park or neutral for more airflow is recommended.
• If equipped with a snow plow. Activate the snow plow  mode.