NO.18 COOLING SYSTEM CONCERNS-RUNS COLD [L8, LF, L5]
id010346802400
18 |
COOLING SYSTEM CONCERNS-RUNS COLD |
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DESCRIPTION
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Engine takes excessive time to reach normal operating temperature.
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POSSIBLE CAUSE
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• Thermostat malfunction
• Cooling fan system malfunction
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Diagnostic procedure
STEP |
INSPECTION |
RESULTS |
ACTION |
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1
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Is the customer complaint "Lack of passenger compartment heat" only?
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Yes
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Inspect A/C and heater system.
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No
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Go to the next step.
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2
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Does the engine speed continue at fast idle?
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Yes
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Go to symptom troubleshooting "No.9 Fast idle/runs on".
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No
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Go to the next step.
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3
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Cool down the engine.
Remove the thermostat and inspect operation.
Is the thermostat normal?
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Yes
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Go to the next step.
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No
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Replace the thermostat.
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4
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Inspect the cooling fan control system operation.
Does the cooling fan control system function properly?
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Yes
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Access the ECT PID.
Inspect both the ECT PID and the temperature gauge on instrument cluster readings.
• If the temperature gauge on the instrument cluster indicates a normal range but the ECT PID is not the same as the temperature gauge reading, inspect the ECT sensor.
• If the temperature gauge on the instrument cluster indicates a cold range but the ECT PID is normal, inspect the temperature gauge and heat gauge unit.
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No
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Repair or replace the malfunctioning part.
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5
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• Verify test results.
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