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Home >> Jeep >> 2007 >> Commander 4WD V8-4.7L VIN N >> Repair and Diagnosis >> Engine, Cooling and Exhaust >> Cooling System >> Testing and Inspection >> Preliminary Checks
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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
- Trailer towing
- Steep grades
- Any accessory addition that fully or partially blocks the grille opening

Driving techniques that avoid overheating are:

- Idle with A/C off when temperature gauge is at end of normal range.
- Increase engine speed for more air flow is recommended.

1. TRAILER TOWING:

Consult Trailer Towing section of owners manual. Do not exceed limits.

2. RECENT SERVICE OR ACCIDENT REPAIR:

Determine if any recent service has been performed on vehicle that may effect cooling system. This may be:

- Engine adjustments (incorrect timing)
- Slipping engine accessory drive belt(s)
- Brakes (possibly dragging)
- Changed parts. Incorrect water pump, or pump rotating in wrong direction due to belt not correctly routed
- 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.

These charts are to be used as a quick-reference only. Refer to the group text for information.


Cooling System Diagnosis Chart (Part 1):




Cooling System Diagnosis Chart (Part 2):




Cooling System Diagnosis Chart (Part 3):




Cooling System Diagnosis Chart (Part 4):




Cooling System Diagnosis Chart (Part 5):




Cooling System Diagnosis Chart (Part 6):





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