Component Tests and General Diagnostics

Cooling System Diagnosis Chart A:

Chart A

Cooling System Diagnosis Chart B:

Chart B

UNCOMMON COOLING SYSTEM PROBLEMS

PROBLEMS NOT REQUIRING DISASSEMBLY OF THE COOLING SYSTEM

1. Locate and remove large external obstructions blocking the radiator or the condenser.

^ Auxiliary oil cooler.

^ License plates.

^ Spare tires.

^ Ice, mud, or snow obstructing the grille.

2. Engine oil is over-filled.

3. Incorrect radiator for the application.

^ Check the part number.

4. Loose, damaged, or missing air seals.

5. Missing or damaged lower air baffle.

6. Incorrect ignition timing.


PROBLEMS REQUIRING DISASSEMBLY OF THE COOLING SYSTEM

1. Incorrect or damaged tan.

2. Worn or damaged emission system components.

^ Damaged PCV valve, TVS or TCS.

^ Malfunctioning emission system components could cause overheating at idle.

3. Pressure-check the cooling system with the pressure cap installed.

^ Shows it the pressure cap leaks because of radiator tiller neck damage.

4. Worn or damaged water pump.

^ Impeller vanes eroded or broken.

^ Worn or damaged bearing and/or seal-check for shaft or bearing play.

5. Plugged radiator tubes.

^ Perform a flow check.

6. Internal system leaks.

^ Head gasket.

^ Cracked block.

^ Timing chain cover.

^ Intake manifold gasket.

7. Plugged coolant passages in the cylinder heads.

^ Visual check.