NO.14 COOLING SYSTEM CONCERNS-RUNS COLD [WL-3]
id0103b5913400
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14
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Cooling system concerns—runs cold
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DESCRIPTION
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• Engine does not 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
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STEP |
INSPECTION |
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 the 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.6 SLOW RETURN TO IDLE/FAST IDLE."
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No
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Go to the next step.
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3
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• 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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• Verify the test results. If normal, return to the diagnostic index to service any additional symptoms.
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