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18
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COOLING SYSTEM CONCERNS -RUNS COLD
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DESCRIPTION |
Engine takes excessive period for reaching normal operating temperature.
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POSSIBLE CAUSE |
• Thermostat malfunction
• Cooling fan system malfunction
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Diagnostic procedure
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STEP
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INSPECTION
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RESULTS
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ACTION
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1
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Is only customer complaint "Lack of passenger compartment heat"?
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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 remain 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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Remove the thermostat and inspect operation.
(See THERMOSTAT INSPECTION [L3].)
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 cooling fan control system operation.
Does the cooling fan control system operate properly?
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Yes
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Access the ECT PID.
Inspect both ECT PID and temperature gauge readings.
• If the temperature gauge indicates normal range but the ECT PID is not the same as the temperature gauge reading, inspect the ECT sensor.
• If the temperature gauge indicates cold range but 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.
• If normal, return to the diagnostic index to service any additional symptoms.
• If any malfunction remains, inspect related service information, and repair or diagnosis.
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