Pinpoint Test B: Pinpoint Test

• Carry out the INSPECTION AND VERIFICATION  procedure in this service information.

Are any concerns present? 

• Yes  : REPAIR as needed.
• No  : GO to B2 

• Check the radiator or A/C condenser for an external obstruction such as leaves or cardboard.

Is an obstruction present? 

• Yes  : REMOVE the obstruction.
• No  : GO to B3 

• Ignition OFF.
• Visually check the engine coolant level in the coolant expansion tank and adjust as necessary. Pressure test the cooling system.

Does the engine cooling system leak externally? 

• Yes  : REPAIR or INSTALL new components.
• No  : GO to B4 

• Inspect the engine coolant in the coolant expansion tank for signs of engine oil.

Is engine oil evident in the coolant? 

• Yes  : REFER to: ENGINE .
• No  : GO to B5 

• Remove the oil level indicator from the engine.

Is coolant evident in the oil? 

• Yes  : REFER to: ENGINE .
• No  : GO to B6 

• 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 .
• No  : GO to B7 

• Check the coolant for dirt, rust or contamination and check the coolant concentration.

Is the coolant condition OK? 

• Yes  : GO to B8 
• No  : FLUSH the engine cooling system.

  REFER to: COOLING SYSTEM DRAINING AND VACUUM FILLING .

• Start the engine.
• Place the climate control function selector in the MAX A/C position and the blower motor switch in the HI position.

Did the electric cooling fan operate? 

• Yes  : GO to B9 
• No  : DIAGNOSE the electric cooling fan operation. REFER to the ENGINE CONTROLS - SYMPTOM CHARTS (EXCEPT DIESEL & HYBRID) (SECTION 3) SYMPTOM CHARTS.

• Start the engine.
• Allow the engine to run for 30 minutes. Place the climate control function selector in the MAX HEAT position. Feel the heater outlet hose.

Is the heater outlet hose hot? 

• Yes  : GO to B10 
• No  : INSTALL a new coolant pump.

  REFER to: COOLANT PUMP .

• Start the engine.
• Allow the engine to run for 30 minutes. Place the climate control function selector in the MAX HEAT position. Feel the lower radiator hose.

Is the lower radiator hose hot? 

• Yes  : CHECK the temperature gauge operation.

  REFER to: INSTRUMENTATION, MESSAGE CENTER AND WARNING CHIMES .

• No  : GO to B11 

• Carry out the THERMOSTAT VISUAL INSPECTION  in the Component Tests portion of this service information.

Is the thermostat damaged? 

• Yes  : INSTALL a new thermostat.

  REFER to: THERMOSTAT .

• No  : INSTALL a new thermostat.

  REFER to: THERMOSTAT .

  If the engine still overheats, INSTALL a new radiator. REFER to: RADIATOR .