Symptoms
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Possible Causes
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Remedy
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Coolant leakage
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| • |
From the bleed hole of the water pump
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Visually check
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| • |
Check leaks after about ten-minute warming up.
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| • |
If coolant still leaks, replace a water pump.
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|
| • |
If leakage stops, reuse the water pump (Do not replace the pump
with a new one).
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|
|
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| • |
Check the tightening of the water pump mounting bolts.
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|
| • |
Retighten the mounting bolts.
|
|
| • |
Check damage of gaskets or inflow of dust.
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|
| • |
Replace the gasket and clean dust off.
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|
| • |
From outer surface of water pump
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|
| • |
Check the material or any cracks of the water pump.
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|
| • |
Poor material. If any crack found, replace the water pump.
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|
Noise
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|
Inspection with a stethoscope
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| • |
After starting the engine, check noise with a stethoscope.
|
|
| • |
If there is no noise, reuse the water pump(do not replace it).
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|
| • |
If there is any noise from the water pump, remove the drive
belt and recheck.
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|
Inspection after removing a drive belt
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| • |
After removing a water pump and a drive belt, check noise again.
|
|
| • |
If there is noise, reuse the water pump. Check other drive line
parts.
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|
| • |
If there is no noise, replace the water pump with a new one.
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|
Inspection after removing a water pump
|
| • |
After removing a water pump and a drive belt, check noise again.
|
|
| • |
If there is any interference between them, replace the water
pump with a new one.
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|
Overheating
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|
Loosened impeller
|
| • |
Corrosion of the impeller wing
|
|
| • |
Poor coolant quality / Maintenance check
|
|
| • |
Impeller seperation from the shaft
|
|
| • |
Replace the water pump.
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Water pump Components and components location
Thermostat Components and components location