Preliminary Checks

PRELIMINARY CHECKS

ENGINE COOLING SYSTEM OVERHEATING

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
- SLIGHT TAIL WIND AT IDLE
- SLOW TRAFFIC
- TRAFFIC JAMS
- HIGH SPEED OR STEEP GRADES

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.

RECENT SERVICE OR ACCIDENT REPAIR:

- Engine adjustments (incorrect timing)
- Slipping accessory drive belt
- Brakes (possibly dragging)
- Changed parts (incorrect water pump)
- Reconditioned radiator or cooling system refilling (possibly under filled or air trapped in system).

NOTE: If investigation reveals none of the previous items as a cause for an engine overheating complaint, refer to following Cooling System Diagnosis charts.

TRAILER TOWING:

Consult Trailer Towing owners manual. Do not exceed limits.

These charts are to be used as a quick-reference only.

Temperature Gauge Reads Low (Part 1):

Temperature Gauge Reads Low (Part 2):

Temperature Gauge Reads Low (Part 3):

Temperature Gauge Reads Low (Part 4):

Temperature Gauge Reads Low (Part 5):

Temperature Gauge Reads Low (Part 6):