Pinpoint Test

WARNING: Always allow the engine to cool before opening the cooling system. Do not unscrew the coolant pressure relief cap when the engine is operating or the cooling system is hot. The cooling system is under pressure; steam and hot liquid can come out forcefully when the cap is loosened slightly. Failure to follow these instructions may result in serious personal injury.

CARRY OUT INSPECTION AND VERIFICATION
1. Carry out Inspection and Verification. REFER to SYMPTOM CHART: ENGINE COOLING .
  - Were any concerns found?
  - Yes: REPAIR as needed. TEST the system for normal operation.
  - No: GO to step 2 .
CHECK FOR Diagnostic Trouble Code (DTC) P0125 or P0128
1. Check for Diagnostic Trouble Code (DTC) P0125 or P0128.
  - Is Diagnostic Trouble Code (DTC) P0125 or P0128 present?
  - Yes: GO to step 3 .
  - No: The cooling system is operational. If an inoperative temperature gauge is suspected, CHECK the temperature gauge operation. REFER to DIAGNOSTIC ROUTINE D . If an inoperative climate control system is suspected, CHECK the climate control system operation. REFER to DIAGNOSTIC ROUTINE I or REFER to DIAGNOSTIC ROUTINE G . If any other Powertrain Control Module (PCM) Diagnostic Trouble Codes (DTCs) are retrieved, REFER to DTC Chart: Powertrain Control Module (PCM) .
CHECK THE ELECTRIC COOLING FAN OPERATION
1. Allow the engine to cool.
2. Make sure the Air Conditioning (A/C) switch is OFF.
3. Start the engine.
4. Check the electric cooling fan.
  - Is the electric cooling fan on all the time?
  - Yes: DIAGNOSE the electric cooling fan operation. REFER to ENGINE CONTROLS - INTRODUCTION -- GASOLINE MODELS .
  - No: GO to step 4 .
CHECK THE COOLANT LEVEL
NOTE: Allow the engine to cool before checking the coolant level.
1. Visually check the engine coolant level in the coolant expansion tank.
  - Is the engine coolant level within specification?
  - Yes: INSTALL a new thermostat. TEST the system for normal operation.
  - No: REFER to DIAGNOSTIC ROUTINE A .