Pinpoint Test C: The Engine Does Not Reach Normal Operating Temperature

WARNING: This page is about a different car, the 2013 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.

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.

C1 CARRY OUT INSPECTION AND VERIFICATION
- Carry out the INSPECTION AND VERIFICATION procedure.
- Were any concerns found?
- Yes : REPAIR as needed. TEST the system for normal operation.
- No : GO to C2.
C2 CHECK FOR DTC P0125 or P0128
- Check for DTC P0125 or P0128.
- Is DTC P0125 or P0128 present?
- Yes : GO to C3.
- No : The cooling system is operational. If an inoperative engine temperature gauge is suspected, CHECK the engine temperature gauge operation. REFER to INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES . If an inoperative climate control system is suspected, CHECK the climate control system operation. REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . If any other DTCs are retrieved, REFER to MULTIFUNCTION ELECTRONIC MODULES .
C3 CHECK THE ELECTRIC COOLING FAN OPERATION
- Allow the engine to cool.
- Make sure the A/C switch is OFF.
- Start the engine.
- Check the electric cooling fan.
- Is the electric cooling fan on all the time?
- Yes : DIAGNOSE the electric cooling fan operation. REFER to the ENGINE CONTROLS - INTRODUCTION (EXCEPT DIESEL & HYBRID) (SECTION 0) .
- No : GO to C4.
C4 CHECK THE COOLANT LEVEL
- NOTE: Allow the engine to cool before checking the coolant level.
  
  Visually check the engine coolant level in the degas bottle.
- Is the engine coolant level within specification?
- Yes : INSTALL a new thermostat. TEST the system for normal operation.
- No : GO to PINPOINT TEST A to diagnose a coolant leak.