Pinpoint Test C :

WARNING: This page is about a different car, the 2018 Lincoln MKC. 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 in this article. Refer to: Inspection and Verification .
Were any concerns found?

Yes REPAIR as needed.

No GO to C2

C2 CHECK FOR DTC P0125 OR P0128

Using a scan tool, perform the PCM self-test.

Is DTC P0125 or P0128 present?

Yes

GO to C3

The cooling system is operational. If an inoperative temperature gauge is suspected, CHECK the 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 . If any other Diagnostic Trouble Codes (DTCs) are retrieved, REFER to: Electronic Engine Controls .

C3 CHECK THE COOLANT LEVEL

NOTE: Allow the engine to cool before checking the coolant expansion tank.

Visually check the engine coolant level in the coolant expansion tank

Is the engine coolant level within specification?

Yes	INSTALL a new thermostat housing. REFER to: Thermostat Housing . CLEAR Diagnostic Trouble Codes (DTCs). If the DTC returns check for correct CHT sensor and ECT sensor operation.

No	GO to Pinpoint Test A