Pinpoint Tests

Pinpoint Tests

PINPOINT TEST G1390311p1 : LOSS OF COOLANT

G1390311t1 : VISUAL INSPECTION
1 Visually inspect for loss of coolant.
2 Carry out a system pressure test. See component tests. Component Tests and General Diagnostics
- Is the engine cooling system leaking?

->Yes
Rectify the leak as indicated by the test result. Top-up and fill the cooling system to the correct level with the correct specification fluid as necessary. For additional information, refer to Specifications [1][2]Specifications
For additional information, refer to Cooling System Draining, Filling and Bleeding Cooling System Draining, Filling and Bleeding TEST the system for correct operation.

->No
Verify the customer complaint.

PINPOINT TEST G1390311p2 : THE ENGINE OVERHEATS

G1390311t2 : CHECK COOLANT

WARNING: The cooling system is pressurized! Ensure the reservoir cap is never released until the system has cooled. Failure to follow these instructions may result in personal injury.
1 Check the coolant level and condition.
- Does the system contain sufficient coolant of the correct specification?

->Yes
GO to Pinpoint Test G1390311t3.

->No
Top-up and fill the cooling system to the correct level with the correct specification fluid as necessary. For additional information, refer to Engine Cooling Locations
For additional information, refer to Cooling System Draining, Filling and Bleeding Cooling System Draining, Filling and Bleeding Check for coolant loss.
GO to Pinpoint Test G1390311p1.

G1390311t3 : CHECK COOLANT EXPANSION TANK PRESSURE CAP
1 Check the coolant expansion tank pressure cap for damage/correct operation. REFER to the coolant expansion tank pressure cap pressure test in this section.
- Is the coolant expansion tank pressure cap operating correctly?

->Yes
GO to Pinpoint Test G1390311t4.

->No
INSTALL a new coolant expansion tank pressure cap. TEST the system for correct operation.

G1390311t4 : CHECK THERMOSTAT
1 Check the thermostat for correct operation. REFER to the thermostat component test. Component Tests and General Diagnostics
- Is the thermostat operating correctly?

->Yes
Check for correct operation of cooling fans, circuits, sensors, modules, etc. For additional information, refer to Electronic Engine Controls Testing and Inspection

->No
INSTALL a new thermostat. For additional information, refer to Thermostat TEST the system for correct operation.

PINPOINT TEST G1390311p3 : THE ENGINE DOES NOT REACH NORMAL OPERATING TEMPERATURE

G1390311t5 : CHECK THERMOSTAT
1 Check the thermostat for correct operation. REFER to the thermostat component test. Component Tests and General Diagnostics
- Is the thermostat operating correctly?

->Yes
Check for correct operation of cooling fans, circuits, sensors, modules, etc. For additional information, refer to Electronic Engine Controls Component Tests and General Diagnostics


->No
INSTALL a new thermostat. For additional information, refer to Thermostat Service and Repair TEST the system for correct operation.