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NO.18 COOLING SYSTEM CONCERNS-RUNS COLD [AJ]

BME010300103223

18 | Cooling system concerns-runs cold
DESCRIPTION | • Engine takes excessive period for reaching normal operating temperature.
POSSIBLE CAUSE | • Thermostat malfunction • Condenser fan system malfunction • Cooling fan system malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | • Is customer complaint "Lack of passenger compartment heat" only? | Yes | Inspect the A/C and the heater systems.
No | Go to the next step.
2 | • Does the engine speed continue at fast idle? | Yes | Go to symptom troubleshooting "No.9 Fast idle/runs on". (See NO.9 FAST IDLE/RUNS ON [AJ].)
No | Go to the next step.
3 | • Remove the thermostat and inspect the operation. (See THERMOSTAT REMOVAL/INSTALLATION [AJ].) (See THERMOSTAT INSPECTION.) • Is the thermostat normal? | Yes | Access ECT PID on the WDS or equivalent. Inspect both ECT PID and the temperature gauge on the instrument cluster readings. • If the temperature gauge on the instrument cluster indicates normal range but ECT PID is not the same as the temperature gauge reading, inspect the ECT sensor.
• If the temperature gauge on the instrument cluster indicates cold range but ECT PID is normal, inspect the temperature gauge and heat gauge unit.
No | Replace thermostat.
4 | • Verify test results.

  - If normal, return to diagnostic index to service any additional symptoms.
  - If malfunction remains, inspect related Service Information and perform repair or diagnosis.

  • If vehicle is repaired, troubleshooting completed.
  • If vehicle is not repaired or additional diagnostic information is not available, replace or reprogram the PCM.