Symptom Related Diagnostic Procedures

COOLING SYSTEM

Establish what driving condition caused the cooling system complaint. The problem may be caused by an abnormal load on the system such as the following: prolonged idle, very high ambient temperature, slight tail wind at idle, slow traffic speed, traffic jam, high speed, steep grade.

VISUAL INSPECTION

If the cooling system problem is not caused by a driving condition, perform a visual inspection to determine if there was a recent service or accident repair, including the following:

- Loose/damaged accessory drive belt
- Incorrect cooling system refilling (trapped air or low level)
- Brakes possibly dragging
- Damaged hoses
- Loose/damaged hose clamps
- Damaged/incorrect engine thermostat
- Damaged radiator fan motor, fan blade and fan shroud
- Damaged head gasket
- Damaged water pump
- Damaged radiator
- Damaged coolant recovery system
- Damaged heater core

If the visual inspection reveals none of the above as cause for a cooling system complaint, refer to the following diagnostic charts.

COOLING SYSTEM DIAGNOSIS CHART










TEMPERATURE GAUGE INDICATION DIAGNOSIS CHART