| PRESSURE CAP IS BLOWING OFF STEAM AND/OR COOLANT. TEMPERATURE GAUGE READING MAY BE ABOVE NORMAL BUT NOT HIGH. COOLANT LEVEL MAY BE HIGH IN COOLANT RESERVE/OVERFLOW TANK. |
- Pressure relief valve in pressure cap is defective, or was not properly seated.
- Incorrect cap was installed.
- Incorrect coolant mixture.
|
- Check condition of pressure cap and cap seal. (Refer to DIAGNOSIS AND TESTING
) Replace cap as necessary.
- Replace cap as necessary.
- Check concentration level of the coolant. (Refer to DIAGNOSIS AND TESTING - COOLANT CONCENTRATION TESTING
) Adjust the ethylene glycol-to-water ratio as required.
|
| COOLANT LOSS TO THE GROUND WITHOUT PRESSURE CAP BLOWOFF. GAUGE IS READING HIGH OR HOT. |
- Coolant leaks in radiator, cooling system hoses, water pump or engine.
|
- Pressure test and repair as necessary. (Refer to DIAGNOSIS AND TESTING
)
|
| DETONATION OR PRE-IGNITION (NOT CAUSED BY IGNITION SYSTEM). GAUGE MAY NOT BE READING HIGH. |
- Engine overheating.
- Freeze point of coolant not correct. Mixture too concentrated or too diluted.
- Incorrect cooling system pressure cap.
|
- Check reason for overheating and repair as necessary.
- Check concentration level of the coolant. (Refer to COOLANT
) Adjust the ethylene glycol-to-water ratio as required.
- Install correct pressure cap.
|
| HOSE(S) COLLAPSE AS ENGINE, COOLS DOWN. |
- Vacuum created in cooling system on engine cool-down is not being relieved through coolant recovery system.
|
-
- Pressure cap relief valve stuck. (Refer to DIAGNOSIS AND TESTING
) Replace as necessary.
- Hose between the radiator and overflow container is plugged or pinched. Clean and repair as necessary.
- Vent at coolant pressure container is plugged. Clean vent and repair as necessary.
- Pressure container is internally blocked. Clean and repair as necessary.
|
| INADEQUATE AIR CONDITIONER PERFORMANCE (COOLING SYSTEM SUSPECTED). |
- Radiator and/or A/C condenser is restricted, obstructed, or dirty (insects, leaves, etc.).
- Electrical radiator fan not operating when A/C is operated.
- Engine is overheating (heat may be transferred from radiator to A/C condenser). High underhood temperatures due to engine overheating may also transfer heat to A/C components.
- All models are equipped with air seals at the radiator and/or A/C condenser. If these seals are missing or damaged, not enough air flow will be pulled through the radiator and A/C condenser.
|
- Remove restriction and/or clean as necessary.
- For test procedure (Refer to POWERTRAIN DIAGNOSTIC PROCEDURES
). Repair as necessary.
- Correct overheating condition.
- Check for missing or damaged air seals and repair as necessary.
|
| INADEQUATE HEATER PERFORMANCE. |
- Check for a Diagnostic trouble code (DTC).
- Coolant level low.
- Obstructions in heater hose fitting at engine or at heater core.
- Heater hose kinked.
- Water pump is not pumping coolant to heater core.
- Air trapped in heater core.
|
- For procedures, (Refer to POWERTRAIN DIAGNOSTIC PROCEDURES
). Repair as necessary.
- (Refer to COOLANT
) Repair as necessary.
- Remove heater hoses at both ends and check for obstructions. Repair as necessary.
- Locate kinked area and repair as necessary.
- When the engine is fully warmed up, both heater hoses should be hot to the touch. If only one of the hoses is hot, the water pump may not be operating correctly. Replace components as necessary.
- (Refer to DIAGNOSIS AND TESTING
)
|
| HEAT ODOR |
- Various heat shields are used at certain driveline components. One or more of these shields may be missing.
- Temperature gauge reading above the normal range.
- Radiator fan operating incorrectly.
- Undercoating been applied to an unnecessary component.
- Engine may be running rich, causing the catalytic converter to overheat.
|
- Locate missing shields and replace or repair as necessary.
- Refer to Gauge Is Reading High in TEMPERATURE GAUGE INDICATION DIAGNOSIS CHART
.
- (Refer to OPERATION
) Repair as necessary.
- Clean undercoating as necessary.
- (Refer to POWERTRAIN DIAGNOSTIC PROCEDURES
) Repair as necessary.
|
| POOR DRIVEABILITY (THERMOSTAT POSSIBLY STUCK OPEN). GAUGE MAY BE READING LOW. |
- The engine thermostat must be operating correctly for proper driveability, clean vehicle emissions, and the prevention of sludge buildup in the engine oil. Check for a diagnostic trouble code.
|
- (Refer to POWERTRAIN DIAGNOSTIC PROCEDURES
) Replace thermostat, if necessary.
|
| STEAM IS COMING FROM FRONT OF VEHICLE NEAR GRILL AREA WHEN WEATHER IS WET, ENGINE WARMED UP AND RUNNING WITH VEHICLE STATIONARY, OR JUST SHUT OFF. TEMPERATURE GAUGE IS NORMAL. |
- During wet weather, moisture (snow, ice, rain, or condensation) on the radiator will evaporate when the thermostat opens. The thermostat opening allows heated coolant into the radiator. When the moisture contacts the hot radiator, steam may be emitted. This usually occurs in cold weather with no fan or air flow to blow it away.
|
- Occasional steam emitting from this area is normal. No repair is necessary.
|
| COOLANT COLOR |
- Coolant color is not necessarily an indication of adequate corrosion or temperature protection. Do not rely on coolant color for determining condition of coolant.
|
- Check the freeze point of the coolant. (Refer to COOLANT CONCENTRATION TESTING
) Adjust the ethylene glycol-to-water ratio as necessary.
|
| COOLANT LEVEL CHANGES IN COOLANT BOTTLE. TEMPERATURE GAUGE IS IN NORMAL RANGE |
- Level changes are to be expected as coolant volume fluctuates with engine temperature. The coolant level will also drop as the system removes air from a recent filling.
|
- A normal condition. No repair is necessary.
|