Pinpoint Test A : Loss Of Coolant
WARNING: This page is about a different car, the 2018 Lincoln Navigator. 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.
- A1 CARRY OUT INSPECTION AND VERIFICATION
- Carry out Inspection and Verification.
Are any concerns present?
Yes REPAIR as needed. No GO to A2 - A2 CHECK THE ENGINE COOLANT LEVEL AND PRESSURE TEST THE ENGINE COOLING SYSTEMNOTE: Allow the engine to cool before checking the engine coolant level.
- Ignition OFF
- Visually inspect the engine coolant level at the degas bottle and adjust as necessary. Pressure test the engine cooling system. Refer to Cooling System Pressure Test .
Does the engine cooling system leak externally?
Yes REPAIR or INSTALL new components. No GO to A3 - A3 CHECK THE ENGINE COOLANT FOR AN INTERNAL LEAK
- Inspect the engine coolant in the degas bottle for signs of engine oil.
Is engine oil evident in the engine coolant?
Yes REFER to:ENGINE SYSTEM - GENERAL INFORMATION . No GO to A4 - A4 CHECK THE ENGINE OIL FOR COOLANT
- Remove the oil level indicator from the engine.
Is coolant evident in the oil?
Yes REFER to:ENGINE SYSTEM - GENERAL INFORMATION . No GO to A5 - A5 CHECK THE ENGINE COOLANT FOR TRANSMISSION FLUID
- Check the engine coolant in the degas bottle for signs of transmission fluid.
Is transmission fluid evident in the engine coolant?
Yes INSTALL a new transmission fluid cooler. REFER to: Transmission Fluid Cooler . REPAIR the transmission as necessary. REFER to: DIAGNOSIS BY SYMPTOM . TEST the system for normal operation. No GO to A6 - A6 CHECK THE TRANSMISSION FLUID FOR ENGINE COOLANT
- Remove the transmission oil leveling plug.
- Check the transmission fluid for engine coolant.
Is engine coolant evident in the transmission fluid?
Yes INSTALL a new transmission fluid cooler. REFER to: Transmission Fluid Cooler . REPAIR the transmission as necessary. REFER to:DIAGNOSIS BY SYMPTOM . TEST the system for normal operation. No GO to A7 - A7 CHECK THE COOLING SYSTEM FOR COMBUSTION GASESNOTE: Use UView® Combustion Leak Tester part number UVU560000-R or equivalent.
- Using a cooling system combustion gas leak tester, following the instructions supplied with the tester, check the coolant for combustion gases.
Are combustion gases present?
Yes REFER to:ENGINE SYSTEM - GENERAL INFORMATION . No The cooling system is operational.