NO.18 COOLING SYSTEM CONCERNS-RUNS COLD [MZR 1.8, MZR 2.0, MZR 2.5]
id0103d4802400
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18 |
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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• A/C and heater system malfunction
• Thermostat malfunction
• Improper operation of cooling fan control system
• Improper indication of water temperature gauge
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Diagnostic procedure
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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 the A/C and heater system.
Repair or replace the malfunctioning part according to the inspection results.
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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 the 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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Perform the Cooling Fan Control System Inspection.
Does the cooling fan control system operate properly?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning part according to the inspection results.
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4
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Cool down the engine.
Remove the thermostat.
Inspect the thermostat operation.
Is there any malfunction?
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Yes
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Replace the thermostat.
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No
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Reinstall the thermostat.
Inspect the water temperature gauge.
• If there is any malfunction:
• If there is no malfunction:
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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 the malfunction remains, inspect the related Service Information and perform the repair or diagnosis.
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